PLOMB Production Code with Alphabet 2-digits, meaning?

[corgibell]

PLOMB Combination Wrenches have several kinds of the production code with alphabet 2-digits.
From my collection, there are 5-kinds, BB, CB, CC, EC and FC.
Let me know the meaning of these production codes.

And also, regarding "RANGER AT 158" model, let me know which kind of Ranger with "AT 158".

 

[matt_i]

Design iteration and the forging line it was produced on ?

This is a guess. This is only a guess.

 

[SilverDeck]

Give this thread a try:

https://www.garagejournal.com/forum/showthread.php?t=459360&referrerid=302271

 

[corgibell]

I understood the meaning of letter & letter code, with thanks.
Still I would like to know the meaning of "AT 158" in RANGER AT 158.

 

[r_olson_06]

I understood the meaning of letter & letter code, with thanks.
Still I would like to know the meaning of "AT 158" in RANGER AT 158.

Ranger AT stamped tools were military production. The 158 is the part number. Plomb made a variety of standard and speciality tools. I think they were for aircraft in WWII.


Looking for a Round Beam Plomb 1068 Double Box End Wrench

 

[corgibell]

Ranger AT stamped tools were military production. The 158 is the part number. Plomb made a variety of standard and speciality tools. I think they were for aircraft in WWII.


Looking for a Round Beam Plomb 1068 Double Box End Wrench

Thanks for your reply.