Date Codes

On Porcelain Insulators Made By

Pittsburg High Voltage Insulator Co.

 

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This is the current list of incuse date stamps found on Pittsburg porcelain insulators.  If you have one not on the list, please contact me so your date can be added.  There was a recent reporting by Bill Haley of dates with ANS instead of Ans'd.  That is very different than the other markings.  It is thought that Pittsburg used a standard business rubber stamp where month and day can be changed along with various business related notations such as Ans'd, Ent'd, Rec'd, PAID, A. M., and P. M.  Obviously they must have used a somewhat different rubber stamp where the notation at the end is all capitalized.  Paul Greaves just reported a Westinghouse strain with marking DEC 23 REC.  I don't recall seeing a date code on a non-pintype.  So, there may be date codes with ENT, too.  The full date markings are manufacturing dates, but we may never know the meaning of the date control markings.

Please report to me any markings not on the list.  Just send an email to: .

Updated as of December 7, 2022

                       Known Pittsburg Date Control Markings

FEB  4 A.M. MAR. 17 P.M. JAN 1 Ans'd  JAN 16 Rec'd
FEB 5 A.M. APR 12 P.M. JAN 5 Ans'd  FEB 15 Rec'd
FEB 18 A.M. APR 16 P.M. APR 6 Ans'd  FEB 27 Rec'd
APR 21 A.M. APR 27 P.M. APR 13 Ans'd  MAR 11 Rec'd
APR 29 A.M. JUN 8 P.M. MAY 12 Ans'd MAR  8  Rec'd
JUN 10 A.M. JUL  7 P.M. MAY 25 Ans'd MAR 22 Rec'd
JUN 27 A.M. JUL 25 P.M. JUN 3 Ans'd MAR 30 Rec'd
AUG 25 A.M. SEP 24 P.M. JUN 10 Ans'd APR 11 Rec'd
SEP 20 A.M. SEP 28 P.M. JUN 14 ANS'D MAY 23 Rec'd
OCT 21 A.M. NOV 25 P.M. JUL 26 Ans'd JUN 23 Rec'd
NOV 26 P.M. AUG 9 Ans'd JUL  1 Rec'd
JAN 17 PAID AUG 13 Ans'd JUL 15 Rec'd
FEB 16 PAID JAN 18 Ent'd AUG 28 Ans'd JUL 28 Rec'd
MAR 25 PAID APR 22 Ent'd NOV 29 Ans'd AUG 12 Rec'd
JUN 26 PAID NOV 15 Ent'd NOV 30 Ans'd AUG 14 Rec'd
JUL  8 PAID

AUG 24 Rec'd
AUG  6 PAID JAN 4 ANS SEP 20 Rec'd
AUG 26 PAID DEC 20 ANS
OCT 18 PAID DEC 21 ANS MAR 8  REC
OCT 27 PAID DEC 23 REC
NOV 15 PAID
NOV 19 PAID
NOV 21 PAID
DEC  3 PAID
        17 PAID

            

                          Known Pittsburg Full Date Markings

FEB 19 1911  JAN 4 1913 JAN 9 1915  AUG 16 1916
FEB 22 1911 JAN 11 1913 JAN 12 1915 SEP 9 1916
MAR 26 1911 FEB 2 1913 JAN 13 1915
JUL 25 1911 FEB 6 1913 JAN 19 1915 JAN 7 1917
FEB 10 1913  JAN 20 1915 JAN 27 1917 
FEB 28 1912 FEB 16 1913 JAN 31 1915 FEB 27 1917
FEB 29 1912   FEB 18 1913 FEB 13 1915 MAR 2 1917
MAR 15 1912  MAR 19 1913 FEB 24 1915 APR 19 1917
JUN 14 1912 MAR 22 1913 FEB 27 1915 MAY 2 1917
JUN 24 1912  APR 22 1913 MAR 2 1915 MAY 28 1917
JUL 25 1912 APR 29 1913 MAR 5 1915 JUN 8 1917
AUG 2 1912 APR 30 1913 MAR 6 1915 JUN 12 1917
AUG 14 1912 MAY 2 1913  MAR 7 1915 JUN 19 1917
SEP 5 1912 MAY 6 1913 MAR 8 1915 JUL 9 1917
MAY 13 1913 MAR 15 1915 JUL 25 1917 
MAY 16 1913 MAR 29 1915 AUG 27 1917 
MAY 26 1913 APR 24 1915 OCT 11 1917
JUN 2 1913 MAY 2 1915 OCT 18 1917 
JUN - 3 1913 MAY 8 1915 NOV 24 1917
JUN - 4 1913 JUN 6 1915 DEC 11 1917 
JUN 5 1913 JUN 7 1915 
JUN 17 1913 JUN 11 1915  SEP 6 1918
AUG 5 1913 JUN 20 1915
AUG 10 1913 JUN 25 1915
AUG 12 1913 JUN 27 1915 JAN 4 919
AUG 19 1913 JUN 28 1915 JAN-9 919
SEP 14 1913 AUG -2 1915 
SEP 18 1913 AUG 15 1915 JAN 12 1921
SEP 20 1913  AUG 24 1915 FEB 8 1921
NOV 11 1913 SEP 5 1915 FEB 11 1921
DEC 6 1913 SEP 15 1915  FEB 12 1921
DEC 7 1913 SEP 20 1915 FEB 17 1921
DEC 13 1913 SEP 23 1915 FEB 18 1921
SEP 25 1915 FEB 21 1921
FEB 29 1914 OCT 5 1915 FEB 28 1921
MAR 3 1914 OCT 12 1915 APR 5-  1921
OCT 14 1915
OCT 15 1915 OCT 6 1922
NOV 7 1915
NOV 8 1915
NOV 10 1915
NOV 29 1915
DEC 2 1915
DEC 16 1915
DEC 29 1915

                                                                              

                                                                               


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