Welcome to the data base. The answer to your question, go to the page for each card look on the right under the card picture where it says "mentions". There are 3 colored boxes with numbers in them, blue means they have the card, red for those who want the card and green is the people who have it for trade/sale. click on the color box, then the next page click on "for sale/trade" it shows the list of members offering up the card.
For O'Neill's 1925 Zee-Nut card there doesn't appear that any members have a copy in there collection or for sale, only one member has it on their wantlist. https://www.tcdb.com/ViewCard.cfm/sid/146198/cid/9471352/1925-Zee-Nut-NNO-Harry-O'Neill Same thing for his 1926 card.
I collect: Baseball, Football, Hockey, Mostly Vintage pre1980, My Homie teams - Washington/Baltimore Teams Senators (Twins, Rangers), Expos/Nationals, Redskins, Capitals, Bullets/Wizards - HOFers - Non-sport (mostly TV shows and movies).
My Trade List is very much a work in progress
CaptKirk42s Trading Card Blog Curly W Cards Strive For '65 YouTube klandersen42
