48 Bowman. I was under the impression that PSA does not grade sheet cut cards. I thought all of the slate back 48 Bowman cards are hand cut from sheets.
I can answer half your question. A few years back PSA did grade the greys, I personally had two grey cards that were slabbed from this set mid grades if I recall correctly nothing as nice as this 8. The PSA number seems to be from a while ago (starts with a zero) so it appears good. As far as the greys all being cut from sheets on that I am not sure and I do not even think that can be accurately researched at this point in time but that is probably the reason PSA will no longer grade them. Take care Art
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Take care
Art
1957 Topps PSA
1961 Fleer SGC