I bought a MD2 + MB1 for my F2 from KEH, marked down to $100 as it was engraved !! I took a chance and ordered it......

It turned out that the Engraved item was the MB1 I had a parts one in my BGN box that was missing a door, swaped the door from the engraved one.

You can get lucky some times.

I have bought a a number of engraved items over the years as the price was right (Govenment Auctions), the best way is to find a Broken Junk camera with a clean base or top plate and do a swap,
I have managed to fill in engravings, using black paint and business card but the results have been always so-so.

Stay away from Rare cameras that are engraved as it is very hard to find a donor camera.