As said, good luck to the seller but maybe 12K would get around 1996/1997 once the band reformed with Peter and Ace and the hype was at maximum.

Maybe it's worth 12K - I know Stu from Queensland got offered 10K for his and he declined

Maybe if Eric Carr was the drummer (the Fox Rox 1950-1991 R.I.P.) was on the game it would be worth more