Quote:
Originally Posted by steve B
Are the VCP numbers representing unique serial numbers? Or jut total sales?
If they're unique serial numbers, what immediately strikes me is the very high turnover percentage. Like on Arellanes, where PSA shows 40 factory 30s, and VCP shows 31 sales.
That's amazing, and makes me wonder if a visual census of nearly all the graded examples might be possible.
I've done some work on it with a known "rare" card, and it's very interesting. And I got nowhere near getting every copy.
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I use the actual cert label number from PSA/SGC and have conditional formatting set so that if a duplicate label number appears, it does not get double counted. Here is an example of what my Excel file looks like
I only use the date column periodically so that if I accidentally close the window, I can get back to the last place I was without having to re-open 50 images to find my place.
I don't bother with the grade of the card, with the unique label number, I am able to weed out duplicates. Of course, if a card was originally in a T206 or T206 SweetCap holder and it was re-holdered into a factory specific slab, then I think the cert number changes. I expect those are very rare here, especially for the commons. The other benefit of using the cert number is that some of the very old scans available, say, from 2007 or 2008, may be too blurry to see the factory number, but I log the cert, and sometimes that card was re-sold years later, with a better scan, and I am able to identify it, which is oddly satisfying, lol.