These are factory cut away/demo for .38SPL. At least that is what I am thinking right now. I have no literature that mentions them, none of the prominent collectors I know have ever seen anything like them. They are an egnima.
They were made for the 310, so that makes then post 1947. Unfortunately the box is not in the best condition and it is impossible to read some hand written notes on the lid.
Thoughts? Questions? Ideas?