Golden Replica Stamps

Hi,

I was cleaning out my shed the other day and found a Golden Replicas of United States Stamps binder from PCS. I didn't know what these were so I looked online and decided to start collecting them. I know they don't have much value, but I thought it would be fun. I purchased a lot of them on ebay and I received a few (all of which are First day of issue). I noticed some of them have a certain series. I was wondering if anyone could tell me a little bit more about collecting these. How many series there are. How many in a certain series there are. How many stamps in general there are. Things like that.

Thanks,
brun4138

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