Several years ago, the T80's with LENOX and UZIT backs sold for $200 to $400 (depending on condition). In recent times, the
market value of these two T80 backs has diminished to $100 - $200. I attribute this to "the law of supply vs. demand". T80's
with either of these two backs are definitely more available than their T206 counterparts.
T80 backs which have held their value ($400 - 900) are the CAIRO MONOPOL and the OLD MILL. The OM back being very rare.
T80 BLANK backs (or INVERTED backs) are often found and don't sell for the high prices that their T206 counterparts do.
TED Z
T206 Reference
.