Sorry if this is the wrong forum, but me and a few other users are starting a serial number registry for the pre-1976 thunderbolts (ones with T-XXXX-D or T-XXXX) and I wanted to post it in case anyone wanted to submit info, etc. for thunderbolts of this vintage. Here is what we have so far:
https://docs.google.com/spreadsheets/d/ ... edit#gid=0
The point of this is mainly to keep track of units but also to help get a better production estimate as to how many Thunderbolts have been built total as that figure is currently unknown, however I am sure it can be figured out in time and with a lot of research and adding up and all that too. Thanks!