Ok, I have a few questions because this is getting interesting.
1. Why does the tag say YS-7041 when the list shows the numbering using three places, for example 741? The 1968 Yenko is numbered just the list, I.E. 8025 is YS-8025.
2. Could you spell Canonsburg (correct spelling) again as you see it on the tag or get a better picture? In your opening post you said it was stamped "cannonsburg pa" with 2 n's. Could be a mispell on your part but want to make sure.
As mentioned, flags are up on this. Never heard of a door tag on a 67 Yenko.
Rick H.