I'm going to bring us up to 50/50. Those look inset to me, in which case they are small damaged areas due to contact with another object. I think that the edges look way too sharp to be linear plating bubbles.
Added: well, two vs. one anyway as I now re-read the frog's reply.
"If you climb a good tree, you get a push."
-----Ghanaian proverb
"The danger we all now face is distinguishing between what is authentic and what is performed."
-----King Adz