So yeah, I just polish my watch crsytal (Seamaster 168.022) and happen to see a spot near the edge of the crystal that canmot be buffed out.

I tried to buff it from the side, and the top but it won't go away. Is it a crack or a scratch on the inside?

 

looks like a crack

 

If it cannot be buffed out .Im sorry to say it's a crack.

 

Mostly likely a crack. If it is shallow might be able to be buffed out, but if it is deep the only option would be to change the plexiglass.

 

Yes it is a crack, but replacing the glass would not be so expensive in my opinion

 

Thank you all for the replies, cheers !