I finally got this kit after searching for it for a couple of years. I usually get outbid on eBay, one time the price went well over my max of $40! Only time I saw it at a show it went for that much. For some reason, only one other person bid on this kit before me. I bid a max of $30 but got it for only $6.16 + $5 shipping. It was a steal!
The kit is marked as 1976, and the quality is very good, especially for a 26 year old kit. Much better than the 1/35 Tamiya one or the 1/32 Monogram one. The detail on the hull doors and hatches is very fine. Too bad it is OOP.
If you're a fan of the M3, look for this kit or it's brother, the M3 Grant. Who knows, you may just get lucky & find it cheap like I did.