Check out the sheriff’s sign from “White Apache” (1968)
the same sheriff sign was used in “Rustler’s Rhapsody” in (1984).
[submitted by Michael McQuarrie]
They used to do that with wanted posters too. For example, the Guy Callaway poster in "For A Few Dollars More" pops up in at least 10 Spaghetti Westerns while the wanted posters that say Django, Sartana, and Trinity have appeared in at least 30.