I don't think the nr. 0041 denotes the maker, I have probably 40+ stickpins on LDO cards & many have this nr. on them; to me it seems like a stock nr. for the card itself. This Submarine Shipyard Workers Badge is covered a bit on page 339 in Angolia's Volume 2. On 27.8.1944, an article on this badge appeared in the German Gr�ne Press (Green Press) showing some pictures of shipyard workers, & a picture of the badge.