Plomb Letter Stampings Study

Given the examples below posted thus far, a clear pattern is emerging regarding the 2 letter stamps.

--- We have yet to find any examples disproving this theory. If we discount the "NR" code as a whole different meaning (we believe it represents something different because you will see some examples with both a date code and the NR code), an oddball "single X" and oddball "single O" stamp, it appears the second letter in the codes follows a pattern of A, B, C, D, and E stampings. Early on we theorized that the letter stamps could represent wartime only produced tools. Supporting this theory is the fact that most tools are stamped B, C, or D while A and E are less common second letter stamps. If we assign 1941 to A, 1945 to E, and the B, C, D accordingly, that trend would make sense based on the U.S. involvement periods in WWII. As of now, we are assuming the first letter of the Letter-Letter codes represent a production month. There were still the traditional Number-Letter codes before the U.S. involvement in the war in 1941, as well as in 1945, but we have found no examples of 1942, 1943 or 1944 Number-Letter codes. We have however uploaded examples of 1945 Number-Letter coded tools and it appears 1945 is the final year for date coding until the 1970's.

Letter Code Image 2 Image 3
Plomb 5461 1/2" Drive 5" Extension 0A
Plomb 1135 DBE Wrench 0B
Plomb 1/2" Drive 11/16 Deep Well Socket 0B
Plomb 5281 3/8" Speeder 0B
Plomb 1/4" Drive 4749 Ratchet 0C
Plomb 1145 DBE Wrench 0C
Plomb 3025 DOE Wrench 0C
Plomb 3026 DOE Wrench 0D
Plomb 1/2" Drive 3/4 Socket 1B
Plomb 1/2" Drive 9/16 6 Pt. Socket 1C
Plomb 1/4" Drive 3/8 Socket 1C
Plomb 4770 1/4" Wobble Extention 1C
Plomb 1/2" Drive Female 5449 1E
Plomb 3040 DOE Wrench 1E
Plomb 1/2" Drive 11/16 Socket 1E
Plomb 1/4" Drive 7/32 Socket 1G
Plomb 5449, 1/2" drive reversible ratchet 1G letter code 1G
Plomb 1/4" Drive 9/32 Socket 1J
Plomb 1/4" Drive 3/8 Socket 1K
Plomb 1/4" Drive 5/16 Socket 5B
Plomb 1/4" Drive 3/8 Socket 5C
Plomb 1/4" Drive 1/4 Socket 5C
Plomb 1/4" Drive 11/32 Socket 5C
Plomb 1/4" Drive 9/32 Socket 5C
Plomb 1/4" Drive 1/4 Socket 5C
Plomb 1147 DBE Wrench AB
Plomb 3/8" Drive Ratchet 5249 AB
Plomb 1122 DBE Wrench AB
Plomb 3/8" Drive Zenith Economy Valve Socket - War Finish AC
Plomb 1/4" Drive 3/16 Socket AC
Plomb 5461 1/2" Drive 5" Extension AC
Plomb 1/4" Drive 11/32 Socket AC
Plomb 1/2" Drive 13/16 Socket BB
Plomb 3026 DOE Wrench BB
Plomb 1/4" Drive Zenith Main Jet Socket BB
Plomb DBE 1125 BB
Plomb 1222 "War Finish" Combination Wrench BC
Plomb 1/4" Drive 1/4 Socket BC
Plomb 1220 "War Finish" Combination Wrench BC
Plomb 8182 DBE Wrench CC
Plomb 1/2" Drive 7/16 Socket CC
Plomb 1/4" Drive 7/16 Socket CC
Plomb 1224 Combination Wrench CC
Plomb 1212 "War Finish" Combination Wrench CC
Plomb WF-7 1/4" Breaker Bar D
Plomb 3/8" Drive Ratchet 5249 DB
Plomb 1/4" Drive 1/4 Socket DB
Plomb 3/8" Drive 5249 Ratchet - War Finish DC
Plomb 1131 DBE Wrench DC
Plomb DBE 1131 DC
Plomb 1/2" Drive 21/32 Socket DC
Plomb 3/8" Drive 5249 Ratchet - War Finish DC
Plomb 1/4" Drive 7/32 Socket E-5C
Plomb 1/4" Drive 11/32 Socket EB
Plomb 3021 "War Finish" DOE Wrench EC
Plomb 3045 DOE Wrench EC
Plomb 1/4" Drive 7/16 Socket FB
Plomb 3020 DOE Wrench FB
Plomb 1210 "War Finish" Combination Wrench FC
Plomb 1218 "War Finish" Combination Wrench FC
Plomb 1214 "War Finish" Combination Wrench GC
Plomb 1216 "War Finish" Combination Wrench GC
Plomb 3/8" Drive 7/16 Socket GC
Plomb 3031 DOE Wrench JC
Plomb 1/2" Drive 7/8 Socket KC