I asked the seller a couple days ago whether he was sure this was not CS7. No reply so far.
The thing is, yes, it does look like it could be P-102s, according to what you quoted huckles888. It says that specimens from 1967 onwards have all zeros and normal block series. It does not distinguish specimens listed as being in the collector series and the other ones, like various countries do by using the maltese cross. I know that not all countries use the maltese cross to do this distinction. Cuba would be one of them who does not use it. This leads me to believe that they look exactly the same. This would mean, two different listings to refer to the same item.
This can be quite confusing as sometimes the catalog value of a specimen listed as P-#s is different than the same specimen in the Collector series. For example, P-102s has a value of 6$ and P-104s an undetermined value(9-10$ on
ebay) while in the collector series P-102a and P-104a, overprinted with SPECIMEN have a combined value of 7$. Granted, they may be the same item, but then what's the point of listing it twice in the catalog if that is the case...
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I'm not sure what the CS7 number is.
What do you mean ? CS7 is the number in the standard catalog. Collector series items have the CS# format.