http://rml1708.com/MyCzechWebpage/czmaim.htmThat type serial number (4 numbers, letter/number or with leter/number first) was the Czech military system, never used on export made rifles. Some military rifles were used to fill contracts, however this was not the usual policy. I have no listings for J3 rifles in my rather limited list. J4 came along in 1937 so J3 would have been the whole alphabet before. (26 or so letters) 1933 sounds about right, I would be interested where you got that from tho geladen?