If the last five digits are around **58300 then this has to be contract C9310 which would be late 1941 / early 1942 as far as I can tell. Does that fit with the trim specs ?
When I first read Ian's comments, I thought that he was talking about the forum pic...and that his idea of erotic was lined up in threes and tied up with string and brown paper. I began to think that I was understanding him at last....