My id tag is missing as well but yours does look slightly different than mine. AFAIK, and According to Toyota, mine has never been apart. I think some putz took it off at some point. I am second owner and all maintain rec came with truck from Toyota.
OK, thanks. I know the head gasket was replaced before I picked up this 80, so maybe the head was a salvage yard part and missing the tag, or the tag of the original head was removed/knocked off at some point before I got the truck.