Good luck
I have done some research on these related to the Pirates because I am a Clemente collector. They can be very confusing. There are some minor crop variations that will be from different years. The best way I was able to compile the information I have on the Pirates was comparing many complete 12 picture sets. There are a couple of guys who are HUGE collectors and documenters of the Jay issues - I unfortunately do not remember their names right now. There may be a couple of threads here on Net 54 about them. You might also find some answers by posting the ones you are curious about.
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