1938 DB series RC pickup steering gear box

[this_is_greg]

Can someone tell what these cast numbers represent on my 1938 Dodge Brothers Series RC pickup mean?

I think the 12132 is a casting number and the C8 maybe date code or core/mold number?

 

I'm asking because I have an opportunity to buy a similar gear box but the numbers are 12132 and C10.

 

Thanks in advance.

Edited December 6, 2019 by this_is_greg (see edit history)