Form: SC 13D

Schedule filed to report acquisition of beneficial ownership of 5% or more of a class of equity securities

April 11, 1997

SC 13D: Schedule filed to report acquisition of beneficial ownership of 5% or more of a class of equity securities

Published on April 11, 1997



SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13D
(Amendment No. 1)




Under the Securities Exchange Act of 1934



DATUM INC.
-----------------------------------------------------------
(Name of Issuer)

Common Stock
(Title or Class and Securities)


23820810
(CUSIP Number of Class of Securities)

Donald C. Lewis
General Counsel
Ball Corporation
10 Longs Peak Drive
Broomfield, Colorado 80021-2510

(Name, Address and Telephone Number of Person Authorized
to Receive Notices and Communications)

April 2, 1997 and
April 11, 1997

(Date of Event which Requires
Filing of this Statement)


If the filing person has previously filed a statement on Schedule 13G to report
the acquisition which is the subject of this Statement because of Rule
13d-1(b)(3) or (4), check the following: ( )

Check the following box if a fee is being paid with this Statement: ( )





SCHEDULE 13D
(Amendment No. 1)



CUSIP No. 23820810

(1) NAMES OF REPORTING PERSONS
S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS

Ball Corporation
35-0160610


(2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP:
(a) ( )
(b) ( )


(3) SEC USE ONLY


(4) SOURCE OF FUNDS*
00


(5) CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO
ITEMS 2(d) or 2(e)( )


(6) CITIZENSHIP OR PLACE OF ORGANIZATION
Indiana



NUMBER OF (7) SOLE VOTING POWER
SHARES 817,778*
BENEFICIALLY
OWNED BY (8) SHARED VOTING POWER
EACH
REPORTING (9) SOLE DISPOSITIVE POWER
PERSON 817,778*
WITH
(10) SHARED DISPOSITIVE POWER


(11) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING
PERSON 817,778*






(12) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11 EXCLUDES CERTAIN
SHARES* ( )


(13) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11
Approximately 15.81% of the shares outstanding as of April 11, 1997


(14) TYPE OF REPORTING PERSON*
CO

*
On April 2, 1997, Efratom Holding, Inc. ("Holding"), a Colorado corporation and
a wholly owned subsidiary of Ball Corporation ("Ball") or ("Parent") sold
400,000 shares (the "Shares") of common stock, for $15.00 per share, of the
Datum Inc. On April 11, 1997, sold an additional 60,000 shares at $15.00 per
share of common stock of Datum Inc. As of April 11, 1997, the Parent and Holding
may be deemed to beneficially own the remaining Shares, as indicated in Rows 11
and 13 of each of the tables above, for purposes of Rule 13d-3 under the
Securities and Exchange Act of 1934, as amended.

Item 1. Security and Issuer

Ball hereby incorporates by reference the information from
Item 1 of the 13D filed by Ball on March 27, 1995. Additionally,
effective April 2, 1997, Holding has sold 400,000 shares of Datum Inc.,
for $15.00 a share. On April 11, 1997, Holding sold 60,000 shares of
Datum Inc., for $15.00 a share.

Item 2. Identity and Background

Ball hereby incorporates the information from Item 2 of the
13D filed March 27, 1995, with respect to its 13D filing. Ball hereby
provides a list of persons in Appendix A as of April 11, 1997. Neither
Parent nor Holding, nor, to the best of Parent's and Holding's
knowledge, any of the persons listed in Appendix A, has, during the
past five years, been convicted in a criminal proceeding (excluding
traffic violations and similar misdemeanors). Neither Parent nor
Holding, nor, to the best of Parent's and Holding's knowledge, any of
the persons listed in Appendix A., has, during the past five years,
been a party to a civil proceeding of a judicial or administrative body
of a competent jurisdiction and as a result of such proceeding was or
is subject to a judgment, decree or final order enjoining future
violations of, or prohibiting or mandating activities subject to,
federal or state securities laws or finding any violation with respect
to such laws.

Item 3. Source and Amount of Funds or Other Consideration

Ball hereby incorporates by reference Item 3 from its 13D
filing filed on March 27, 1995.





Item 4. Purpose of the Transaction

Ball hereby incorporates by reference the information in Item
4 from its 13D filing dated March 27, 1995. Additionally, on April 2,
1997, Holding sold 400,000 shares of Datum Inc., common stock for
$15.00 per share. On April 11, 1997, Holding sold 60,000 shares of
common stock of Datum Inc., for $15.00.

Item 5. Interest in Securities of the Issuer

Ball hereby incorporates by reference the information in Item
5 of its previous 13D filing dated March 27, 1995. Ball hereby amends
Item 5(a), (b) by adding to the following: Holding sold 400,000 shares
of Datum Inc., common stock for $15.00 a share on April 2, 1997. On
April 11, 1997, Holding sold 60,000 shares of the common stock of Datum
Inc.

Item 5(c) is hereby amended in that on August 30,1995, Albert
R. Schlesinger, Vice President and Controller of Parent, disposed of
750 shares of common stock on the open market through a broker at a
price per share of $14.36.

Item 6. Contracts, Arrangements, Understandings or
Relationships With Respect to Securities of the Issuer

Ball hereby incorporates by reference the information in Item
6 of the 13D filing dated March 27, 1995. Ball and Holding offered its
400,000 shares as part of 1,300,000 shares sold by Datum Inc., as part
of a public offering which sale was closed on April 2, 1997. Holding
sold 60,000 more shares of Datum Inc. common stock on April 11, 1997,
pursuant to the same offering. The common stock was offered by several
underwriters principally led by Hambrecht and Quist.

Item 7. Material to be Filed as Exhibits

Item 7 of the 13D filing March 27, 1995, is hereby amended to
include: the Underwriting Agreement which is incorporated by
reference to the registration statement of Datum Inc. (Registration
No. 333-22177, Exhibit 1.1, Form of Underwriting Agreement).

SIGNATURE

After reasonable inquiry and to the best of its knowledge and belief,
the undersigned certifies that the information set forth in this Statement is
true, complete and correct.

Date: April 11, 1997
BALL CORPORATION

By: /s/ GEORGE A. SISSEL
George A. Sissel
Chairman, President and
Chief Executive Officer




EFRATOM HOLDING, INC.

By: /s/ DONALD W. VANLANDINGHAM
Donald W. Vanlandingham
President

APPENDIX A


The following tables set forth the name, residence or business address
and present principal occupation or employment of each director and executive
officer of Ball Corporation and Efratom Holding, Inc. Each such person is a
citizen of the United States of America with the exception of Raymond J.
Seabrook who is a resident of the United States and a citizen of Canada.

A. Directors and Executive Officers of Ball Corporation

Reporting Person Address Principal Occupation

DIRECTORS:

Frank A. Bracken 345 South High Street Attorney, Bingham Summers
Muncie, Indiana 47305 Welsh & Spilman,
Indianapolis, Indiana

Howard M. Dean 345 South High Street Chairman of the Board and
Muncie, Indiana 47305 Chief Executive Officer,
Dean Foods Company,
Franklin Park, Illinois

John T. Hackett 345 South High Street Managing General Partner,
Muncie, Indiana 47305 CID Equity Partners,
Indianapolis, Indiana

R. David Hoover 345 South High Street Executive Vice President,
Muncie, Indiana 47305 Chief Financial Officer
and Treasurer,
Ball Corporation,
Muncie, Indiana

John F. Lehman 345 South High Street Chairman, J. F. Lehman &
Muncie, Indiana 47305 Company, New York,
New York

George McFadden 345 South High Street General Partner,
Muncie, Indiana 47305 McFadden Brothers,
New York, New York

Ruel C. Mercure, Jr. 345 South High Street
Muncie, Indiana 47305

Jan Nicholson 345 South High Street Managing Director of
Muncie, Indiana 47305 Capital Markets Assurance
Corporation (CapMAC),
New York, New York

George A. Sissel 345 South High Street Chairman, President and
Muncie, Indiana 47305 Chief Executive Officer,
Ball Corporation




William P. Stiritz 345 South High Street Chairman and Chief
Muncie, Indiana 47305 Executive Officer,
Ralston Purina Company,
St. Louis, Missouri

CORPORATE OFFICERS:

Richard E. Durbin 345 South High Street Vice President, Information
Muncie, Indiana 47305 Services

Donald C. Lewis 10 Longs Peak Drive Assistant Corporate Secretary
Broomfield, Colorado and General Counsel
80038

Barbara J. Miller 345 South High Street Assistant Corporate Secretary
Muncie, Indiana 47305

Elizabeth A. Overmyer 345 South High Street Corporate Secretary
Muncie, Indiana 47305

Douglas E. Poling 345 South High Street Assistant Treasurer
Muncie, Indiana 47305

Albert R. Schlesinger 345 South High Street Vice President and Controller
Muncie, Indiana 47305

Raymond J. Seabrook 345 South High Street Vice President, Planning
Muncie, Indiana 47305 and Control

Harold L. Sohn 345 South High Street Vice President, Corporate
Muncie, Indiana 47305 Relations

David A. Westerlund 345 South High Street Vice President, Administration
Muncie, Indiana 47305

B. Directors and Executive Officers of Efratom Holding, Inc.

Donald W. Vanlandingham 10 Longs Peak Drive President and Director
Broomfield, Colorado 80038

R. David Hoover 345 South High Street Director
Muncie, Indiana 47305

George A. Sissel 345 South High Street Director
Muncie, Indiana 47305

Donald C. Lewis 10 Longs Peak Drive Vice President
Broomfield, Colorado 80038 and Secretary

W. Keith Tipton 10 Longs Peak Drive Assistant Secretary
Broomfield, Colorado 80038





J. Patrick Dummingan 10 Longs Peak Drive Vice President
Broomfield, Colorado 80038

Eugene P. Morgan 10 Longs Peak Drive Vice President and
Broomfield, Colorado 80038 Treasurer

April 11, 1997




U. S. Securities and Exchange Commission
Attention: Filer Support
Mail Stop 0-7
6432 General Green Way
Alexandria, VA 22312

Ladies and Gentlemen:

Transmitted herewith is Ball Corporation's Schedule 13D (Amendment No. 1) dated
April 11, 1997.

Yours truly,




Robert W. McClelland
Associate General Counsel