SSN PumpkinHead Questions ????

I just got a SSN pumpkin mask in the mail today… On the inside it has # 24 marked on it … The tag says PumpkinHead # 24 of 31 Its signed but not by Tommy Lee Wallace… ill post a few pics… It has a silver shamrock on the R side of it… On the back along center crease in the mold it says a don post mask and i cant read the rest…Mask is a really heavy latex. Can anyone tell me any info about when it was made, or what the 24 of 31 means…