haenel schmeisser alloy mag

[awesome]

I own a Black widow variation, byf 42, black bakelite grips, original finish, all parts matching but not matching mags.( Put a detailed pictures in album if anyone is interesting). One of mags is alloy made. It is very good, high quality mag that works exceptionally well. It have stamped „schmeisser Haenel“ on back and it is milled out of alloy block, not made from alloy tin.
Found on web that it is not so uncommon piece, although they have higher prices (due to quality I presume), but still don't know if they wewre specific for some lugers or they just randomly found. Also I want to know if they were only WWII and prior production or there are post WWII production? Any information appriciated. Thanks. Here is some pics