Marking identification

I recently found and purchased a spare magazine for my P9S .45ACP.
It features a marking that I could not find on the web, does anybody know about it?
Thanks!

http://tinypic.com/r/2lc4e11/5

C:\Program Files (x86)\ABS\Auto Blog Samurai\data\Casting Boolits\thefiringline\2lc4e11.jpg

http://tinypic.com/r/o50tbc/5

C:\Program Files (x86)\ABS\Auto Blog Samurai\data\Casting Boolits\thefiringline\o50tbc.jpg

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