I looked at rosters on the [url=http://www.baseball-almanac.com:2htw8e6q]Baseball Almanac[/url:2htw8e6q] site and for those years (1975-1988) here is who they have listed as wearing #23:
1975-1978: Eduardo Rodriguez
1979-1980: Reggie Cleveland
1980-1985: Ted Simmons (BINGO!)
1988: Joey Meyer
Also...just in case your friend was off by a number, Charlie Moore wore #22 for many of those years and played quite a few games at catcher. Hope this helps.
Trying to find out for a friend of mine - does anyone know who might have worn #23 for the Brewers - the time frame I'm looking for is roughly 1975-1988. She thinks he may have been a catcher, but can't remember.
Thanks in advance,