Identify Mag Manufacturer - Suomi 50 round

[GuteFahrt]

Hi, I've got a Suomi KP/-31 50 round mag with a "J" stamp on it. Wondering what this stamp stands for. I'm presuming it's the manufacturer, but haven't been able to find out. Also there is what I believe to be a painted drill mark which was done to remove another stamp.





Link to image album: http://imgur.com/a/vq3Cm

If anyone knows what the stamp stands for and why the drill mark was done that would be cool

Thanks!

Information

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[Peter Laidler]

I wonder if the drill mark was to eliminate a Nazi waffenampt mark for some reason.

[GuteFahrt]

Thanks for your reply Peter. The diameter of the drill mark is 3.5mm, I can't find a size for the Waffenamt mark online. Can you recommend any online resources that may be able to help me identify the "J" mark? I believe this would identify the country of origin and be a good place to start, I'm wading through a lot of Google search results but not turning up much yet unfortunately. Going to open it up today maybe there will be another mark of interest on an internal component.