Posting From Dale's Site
 

With Dale's permission, I am posting a link to his older site with a multitude of information on Transmissions and tags. Most tag information at the bottom of the page. Hope this helps:
http://chevellestuff.net/qd/muncie.htm

Paul

3950318 XH. late 69 M22?

It's listed on the first 69 internal code list to come out May of 68.