Replacement refers to a lost/stolen regular plate.
First issued ???? (not confirmed before 1922)
Last issued ???? (not confirmed after 1959)
normal passenger colors
marked "REPLACEMENT" 1923-1927?
leading R, followed by weight class/type letter 1928-1959? (RA for passenger light class; RX for dealer; RZ for motorcycle, etc.)
*not confirmed that single-letter R in the 1930's were or were not Replacement