<PAGE>
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G/A
Under the Securities Exchange Act of 1934
(Amendment No. 3)
CIDCO, INC.
------------------------------------------------------------------------------
(Name of Issuer)
Common Stock
------------------------------------------------------------------------------
(Title of Class of Securities)
171768104
------------------------------------------------------------------------------
(CUSIP Number)
January 1, 2000
------------------------------------------------------------------------------
(Date of Event Which Requires Filing of this Statement)
Check the appropriate box to designate the rule pursuant to which this
Schedule is filed:
/ / Rule 13d-1(b)
/X/ Rule 13d-1(c)
/ / Rule 13d-1(d)
<PAGE>
1. Names of Reporting Persons. I.R.S.
Identification Nos. of above persons (entities only).
Arthur A. Watson, Jr.
- --------------------------------------------------------------------------------
2. Check the Appropriate Box if a Member of a Group
(a) / /
(b) / /
- --------------------------------------------------------------------------------
3. SEC Use Only
- --------------------------------------------------------------------------------
4. Citizenship or Place of Organization
U.S
- --------------------------------------------------------------------------------
Number of 5. Sole Voting Power 1,102,500
Shares Bene-
fically by 6. Shared Voting Power 163,300
Owned by Each
Reporting 7. Sole Dispositive Power 1,102,500
Person With:
8. Shared Dispositive Power 233,200
- --------------------------------------------------------------------------------
9. Aggregate Amount Beneficially Owned by Each Reporting Person
1,335,700
- --------------------------------------------------------------------------------
10. Check if the Aggregate Amount in Row (11) Excludes Certain Shares / /
- --------------------------------------------------------------------------------
11. Percent of Class Represented by Amount in Row (9)
9.7
- --------------------------------------------------------------------------------
12. Type of Reporting Person (See Instructions)
IN
- --------------------------------------------------------------------------------
SCHEDULE 13G
ITEM 1(a). CIDCO, INC.
ITEM 1(b). 220 Cochrane Circle,
Morgan Hill, CA 95037
ITEM 2(a). Arthur A. Watson, Jr.
ITEM 2(b). 2787 Burning Daylight Farm,
Free Union, Virginia 22940
<PAGE>
ITEM 2(c). U.S.
ITEM 2(d). Common Stock
ITEM 2(e). 171768104
ITEM 3. None apply
ITEM 4(a). Incorporated by reference to item (9) on the attached cover
page(s).
ITEM 4(b). Incorporated by reference to item (11) on the attached cover
page(s).
ITEM 4(c). (i). Incorporated by reference to item (5) on the attached
cover page(s).
(ii). Incorporated by reference to item (6) on the attached
cover page(s).
(iii). Incorporated by reference to item (7) on the attached
cover page(s).
(iv). Incorporated by reference to item (8) on the attached
cover page(s).
ITEM 5. Not Applicable
ITEM 6. There are people other than the reporting person who are
known to have the right to receive or the power to direct the
receipt of dividends from, or the proceeds from the sale of,
such securities. Watson Strategic Investments, L.P. is the
only such person whose interest relates to more than five
percent of the class.
ITEM 7. Not Applicable
ITEM 8. Not Applicable
ITEM 9. Not Applicable
ITEM 10. By signing below I certify that, to the best of my
knowledge and belief, the securities referred to above were
not acquired and are not held for the purpose of or with the
effect of changing or influencing the control of the issuer of
the securities and were not acquired and are not held in
connection with or as a participant in any transaction having
that purpose or effect.
SIGNATURE
After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.
Dated: February 1, 2000
By: /s/ Arthur A. Watson, Jr.
---------------------------------
Arthur A. Watson, Jr.
