It's almost impossible to know, because
1- a hangtag often didn't stay on the item it originally was attached to
and
2- there are probably no datable catalogs or adverts that include early hangtags or chronicle the change from one style to another
and
3- the bags didn't have date codes or any other method of pinning down a production date until 1994 which was long after
Coach changed the hangtags.
Some questions just CAN'T be answered. So until someone invents an accurate crystal ball or time machine, you're just going to have to accept "we don't know" as an answer.