My Used Bike Buyers Guide notes show that Ross issued a "Signature" bicycle in at least the following years: I suspect the missing years and pre-82 may have existed as well:
Signature Road and Criterium in 1982---Columbus tubing Signature Triad in 1984-85---Columbus tubing Signature in 1988 Signature Pro in 1994 Signature Triad in 1994---Tange tubing
Lou Deeter, Orlando FL