[John1941]

I found one going through my 1972 Topps set: #335 Bill Hands is usually but not always found with a cluster of small marks that look like ink stains on the bare part of his right arm and his cap.

Looking through COMC listings, only 5 of the 45 examples for sale do not have the marks. Both buybacks listed do not have it, which may or may not suggest that Topps is aware of this.

There is also a squiggle like a sideways six to the right of his cap and a blotch above it which seem to be constants.