For all the "Pennsylvania pump" users, I have a question. Bought a pretty decent 760 this evening, and cannot find a year of manufacture for it. The serial number does not begin with a letter like most I've seen. On the receiver above the mag well, the number begins "707...". On the barrel, it is stamped with what looks like a "T X T" with "33" stamped onto the barrel right near it. All the info I can find gives info for the serial numbers with letter designations in front. I believe it is the BDL model, not the basket weave model, and not the older 50's and 60's models. I'm guessing mid 70's to early 80's when they brought out the 7600 it would be made. Thanks for any input.