4. "M" font incorrect. Others too?
I'm not sure if the M is wrong though in the posted picture I agree it just doesn't look right.
I have seen 3 types of M fonts on BB pads. Some with the middle extended to the bottom and others 1/2 way down.
The 3rd is what visually looks like a an ever so slightly wider character width size for both type of M's.
My feeling is that the supplier of the font stamps may vary?
The 8 digit engine stamp is a dead give away.
Ask the seller to come to this group to try to justify the originality or the buyer to warn him/her.
My hats off to you for alerting the potential buyer of this fake!