Vintage 1955 Audio? Output Transformer Vimco. Inc. NOS

Description

The transformer was new and sealed in the box when I got it.  I opened to see if standard or potted.   All I knew was it is and output transformer, labeled on the box.   It was in the standard brown waxed paper used for long time storage.  Please see pictures of both the box information and the info printed on the transformer.   It is certainly unique only three 6.3 outputs and the other two the 120.  It was made when tube was hitting the summit in quality, 1955.
The price may be high but I do not know if these have a reputation for being the best.  Also being military generally better made.  I am also hoping with the high price to draw the attention of someone that knows about these transformers.
But, send your best even if a lot lower.  Am getting to the age that I know that I will never get to those projects envisioned decades ago.  So I will be selling gear from the tube era so please check back once in awhile.  That is the plan.
I got an email from a person that wanted to tell me what was.   He told me something I already knew.  It is marked on top of the transformer; filament.  Still I think it might be of use for tubes like 3 6L6s.  It was probably for some instrument but I thought it might be just right for some one designing a weird amp.