Correct me if I am wrong, but can only think of 4 undersized pins.
Gotlieb's Super Mario Mushroom World which was a redemption game. Alvin G's Punchy the Clown, also a redemption game. Sega's Mini Viper which only saw 1 prototype. Then there is of course safe cracker.
Viper was made to 1950's cabinet dimensions because operators wanted something smaller. Then did poorly when shown so was never made. This was 90's sega and the software was copied from twister which is not a great game to begin with.
Alvin G only made 103 punchy's, but then they were never ever able to sell much of anything so wouldn't use that as a barometer.
That leaves Gottlieb and B/W. Safecracker sold 1100 in 96. This is just as Arcade's really start to die off and operators stopped buying. Mushroom world however only sold 519 during 92. This is the height of Mario and Arcade's were booming, still only 500 units. The game is better than you would think too.