I think that there is some confusion on this part. First : Mostek wasn't in the TTL business, perse Second: I'm pretty sure that the part referenced below was a 7449, a cousin of the 7448. Thirdly : 7429 is most probably a date code. From: Tom Kwasniewski dozen I believe that it's a BCD to 7 segment (LED) decoder with open collector outputs. Not sure of the pinout, though.