Is this 100 Mon coin real?

Does this 100 Mon Ryūkyūtsūhō look authentic?

I think it's this one:

N#51089

Please take a picture of the side stamps that are is focus and crop the picture (we don't need 90%+ background, every smartphone has a simple rectangular cropping feature) also were are the sizes and weight? First impression; it doesn't scream forgery to me.

Cropped down the pics and took more edge photos. It's missing the stamp which is odd to me but I wasn't sure if that's uncommon with these. 

Dimensions are 47mm long, 33mm wide. 19.34g in weight. 

They should always have control stamps but from the looks of the edge it could be that the coin was coated at some point (maybe in lacquer you can see it best in the first picture) and the remnants cover them. I would put the coin in pure acetone for a few hours and see if that stuff dissolves. Could also be ink though which is largely soot which will not dissolve or at worst it's something to “antique” the surface of a forgery.

Thanks, I'll try the acetone and see if it does anything. I see the dimensions are a little on the short side on the length, but I'm not sure if that's typical margin of error for these. Thanks!