France 50 centimes 1919 with and without signature O. Roty

Thank 

Hello!

I have this coin N#691,  with and without signature O. Roty.

Is this a known variety? 

They both still look very well, so it's not wear.

Thank you for your opininion.

Regards,

Tony

1st of all,

make sure the light of both coins are the same, make sure the depth control is the same. The images you have shown are not clear enough, at least for me, to establish an opinion, sorry.