So these cymbals came with an early-70s Pearl kit I bought. Like the drums they were covered in gunk and I assumed since the other cymbal with them was a brass Camber that these were of similar low quality. But then as I looked closer they turned out to be much better than that. However, NO identifying marks at all that I can find--no stamps, nothing! The closest I could come to believing there was anything was an inky-looking splotch on the inside of the bell of one of them. You can see it in pic #3.

Can anyone offer any thoughts on what they might be from the hammer pattern in the pix below? The first three are of the inside of the top hat, the final one's of the outside of the bottom hat, where the lathe marks are more visible. Thanks, all.