[Milsurplus] WWII stock number

[KD7JYK DM09]

> I have a dial glass from 1943.
> Part number A-55F-2837.
> STK-NO-2Z4990-21.
> Contract NO. W-2279-SC-460.

Very vague info online:

United States. War Department · 1944
GLASS : scope : Belmont dwg / part # A - 55F - 2837

Nothing found for the stock number.

And for W-2279-SC-460

I only see one reference to "metal radio knobs", which may not be 
entirely relevant, and no further details, or specifics.

Kurt