Brand new B1 lab finished props come polished now

Labbed props can come in polished or brushed finish depending on what company labs them and what the customer wants.
Usually the have a stamped serial number around the front or back of the hub

If you buy a lab finished prop direct from Mercury, it will be high polish and have more rounded edges like you have here. However, you should have an indication in the part number.

Always hard to tell on used stuff. If its for sale...just sell it as a Bravo. If you intend to use it...just give it a try and see how it does.

I have two props 28P labbed from Merc, very sharp leading edge, high polished. Your prop looks like stock. Good luck.