Pretty happy I found this thread - well sort of, now it looks like I have about a weeks worth of digging through boxes ahead of me.

I stumbled upon these blank backs - I imagine they are pretty standard issue but I haven't been able to find any information on them or similar cards. Any help is appreciated.

Keep up the great work - love the content here!

Nice finds Joe....not sure how common these 1960s blanked backed cards are, however, in many years of going through cards I have come across just this one blank backed Sullivan card. Recently I came across this Harris card with the Essegian back upside down.

Here are a few ghosts......
Attachment 397310

Those are great - I just discovered a 1971 Topps card that has a similar issue as your Harris/Essegian except the back is split between two players, will have to dig that one out again.

1955 Logo Variations
 

This is #14 Fenian and #30 Power. Notice the lack of a top line on the logos. You can see on the Fenian that the bat in the Athletics logo touches to the top margin on one version.

Came across these two 68 Al Jackson cards that were both in the same lot that came in the other day....both copies in the lot have the same obscured print on the back. There is a slight obstruction starting on the card's left side ("Maj." on the totals stat line) to obscuring "E.R.A." on the stats header line to the right. 1967 Topps have multiple cases of recurring print obstructions on card backs, this is one of the first recurring cases I have seen with 1968s. The question now is, does the print obstruction carry over onto either the card to the left or right of this card on the sheet?

Our friend lowpopper/rookie-parade introduced a very similar error/variation on the 1955 Topps Dick Groat on eBay that I was going to show here but forgot to.

I don't think this one has been mentioned. At least I never saw it when compiling my Cardinals variation list for my team sets. Someone can correct me if I'm wrong. I discovered this one the other day.

This one is reoccurring. The yellow-ish upper right corner of the green team name box is the print variation.


https://i.postimg.cc/653Mb3BY/20200513-094106.jpg

The most unbelievable sale ever...yesterday
 

What the...is going on here...yesterday on ebay
1967 Topps Punch-Outs Chico Salmon PSA 6 - none Higher! Mickey Mantle Test RARE

https://img.comc.com/i/Baseball/1973...&size=original
1973 Topps - [Base] #220 - Nolan Ryan
Courtesy of COMC.com

Probably already know about this, but saw two of these on COMC. So it's a recurring print defect. Bought them both so if someone needs it for their collection, let me know.