I saw this on YT so take for grain of salt, but someone "did the math" and each refractor has 8k copies, then there are prizm & ray wave refractors which have 4-6k copies of each card. The Topps Logo fractor is around 600 per card. Sepia I am not sure about but in the thousands for sure. The back of the card should say refractor for all of them. Base cards have a significantly higher production run and do not have the sheen of the refractor.
I always use my work desk which has great lighting for video meetings to organize my cards and take pics if I am slanging them. Refractors stand out.
2021 Stadium Club Baseball had the hardest to recognize refractors IMO they looked the same as SC Chrome inserts and I had to read the back of every card to double check after I realized I had an amazing (at the time) Dylan Carlson RC Refractor.
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