Any help with Japanese chop mark

[jtw1313]

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[Mackaydon]

If you are referring to the image i red, it is referred to as a Chinese seal. Artists could mark their own works with various seals to confirm their signature or authenticity of their work. I'm guessing this is the one of the (possibly of many) personal seals used by this painter.--though I have no idea who that is.
Don.....

 

[jtw1313]

Yes it's basically the signature