This tag is in a 1972 240z engine compartment, regular tag has been removed. This 1972 has an early 1973 engine (1-73 or 2-73). "Big Eddie" replaced engine 8-14-78.

Is this work done by a dealer under warranty ( I don't think so)? Was there a law at one time that required this tag being installed if engine was replaced?

That's not likely a dealer warranty tag.  Most likely "Big Eddie" was a mechanic with a strong sense of complete disclosure who went to a lot of trouble to document an engine swap for the then current and all subsequent owners.  Note that he installed the tag on the firewall over the factory stamping of the VIN and made no attempt to replicate the OE tag.  Good job "Big Eddie"!!!

BTW - welcome to the group.  Tell us a bit more about your car and your plans for it.

Yes, welcome to the group.

Your Z is 10,000 ahead of my '72.  My vin starts with 69,000 something so actually 11,000.  Anywho lets see some pictures! 

I appreciate it!  I am still shopping for my first 240z. I was high bidder on BAT early part on February but it didn't make the reserve.  I was high bidder on eBay but it didn't reach the reserve. The engine tag I asked about was on a car I am looking at. Still looking let me know if you hear of any.

Cedar Park! That's 40mins from where I am! Welcome to the forum. You'll find a whole lot of info here, and very helpful members. Although I don't have much to bring, as I don't own a Z...