Need info on 1969 Topps

Galveston

I dug out my 1969 Topps set. I hadn't looked at it in years and had never looked at it from a grading standpoint. Looks like an equal distribution of PSA 5's, 6's, 7's and 8's.
One thing I noticed is that I have several variations that have the "helmet emblem invisible." I also have the tough to find Purdin variation. I don't know anything about these variations. Do the registry collectors collect the variations? How rare are they? Are they just tough to find in nice condition or are they tough to find in any condition? Anything else I should look for? I have a few white letter variations too but those aren't part of my set. I bought the set in 1969 from Wholesale cards.

Mitochondria

Galveston,

Tough to find Purdin variation? Can you elaborate.

Ron

waitilltheytrytosell

The variation relating to Purdin is found on checklist card #107. On the checklist card, card no#161 is listed as either Jim or John Purdin. Neither one is any more difficult to find than the other.

Galveston

Thanks for the information on the Purdin checklist variation. The population report was leading me to believe otherwise. I knew you guys could help me out. What about the helmet variations?

gemint

The helmet variations are tougher. And there are several variations related to the amount of airbrushing. Ron Sanders is an expert on this and could probably elaborate further. The best indication on difficulty is the population reports, though they are not entirely accurate since PSA often mislabels these types of subtle variations.