Backglass for the Rocket III pinball machine. (Bally, 1967)

Backbox for The Walking Dead pinball machine. (Stern, 2014)

Close up of the backglass of the Kbock Out pinball machine. (Gottlieb, 1950)

Backbox and topper for the Tales From The Crypt pinball machine.

Close up of the backglass of the Outer Space pinball machine. (Gottlieb, 1972)

Animated horse racing in backbox

Backglass for the Strikes & Spares pinball machine. (Bally, 1978)

Close up of the backglass of the Zodiac pinball machine. (Williams, 1971)

Backbox with topper for the Theatre Of Magic pinball machine.

Backbox for Nitro Ground Shaker pinball machine. (Bally, 1978)

Close up of the Little Joe pinball machine backglass. (Bally, 1972)

Backglass for the Bronco pinball machine. (Gottlieb, 1977)

Backbox for the Secret Service pinball machine. (Data East, 1988)

Backbox for the Hook pinball machine. (Data East, 1992)

Backbox for the Twilight Zone pinball machine. (Bally, 1993)

Backbox and topper for the Monster Bash pinball machine.

Close up of the backglass of the Top Score pinball machine. (Gottlieb, 1975)

Blackglass for the Thoro Bred pinball machine. (Gottlieb, 1965)

Backbox and topper for the Monster Bash pinball machine.

Backbox and topper for the Gorgar pinball machine. (Williams, 1979)

Backglass for the Capersville pinball machine. (Bally, 1966)

Backbox for the Palooka pinball machine. (Williams, 1964)

Backbox for the Liberty Bell pinball machine. (Williams, 1977)

Backglass for the Flipper Clown pinball machine. (Gottlieb, 1962)

Backglass for the Fast Draw pinball machine. (Gottlieb, 1975)

Backbox for the Bad Cats pinball machine. (Williams, 1989)

This is the second reason that Mars inner backglasses are super-rare: this tiny clip, and another one on the other side, are all that holds the inner backglass in place at the bottom. It's hard to get a sense of scale from this picture (I should've included a penny) but the lip on that clip is literally less than half a millimeter long.

So, a couple good bumps (as people are wont to do with pinball machines), and the next time the operator opens the backglass to replace a dead bulb the inner backglass comes crashing down.

This is a big part of the reason that I'm going to try to have my replacement inner backglass printed on plexiglass instead of glass-glass.

Backglass for the Super Nova pinball machine. (Game Plan, 1980)

Backbox with topper for the Tee'd Off pinball machine. (Premier Gottlieb, 1993)

Backglass for the Winner pinball machine. (Williams, 1972)

Backbox for the Beat The Clock pinball machine. (Bally Midway, 1985)

Backglass for the Mystery Score pinball machine/bat game. (Midway, 1965)

Backbox and topper for the Apollo 13 pinball machine.

Close up of the backglass of the Lucky Hand pinball machine. (Gottlieb, 1977)

Backbox for the Gamatron pinball machine. (Pinstar, 1985)

Viper night drivin pinball backglass

Close up of the backglass of a Bristol Hills pinball machine.

Topper on the backbox of a Family Guy pinball machine.

Backglass for the Pirate Gold pinball machine. (Chicago Coin, 1969)

X-Men pinball machine backbox with topper.

Backbox for the James Bond 007 pinball machine. (Gottlieb, 1980)

Backbox for the Cyclopes pinball machine. (Game Plan, 1985)

Backbox for the Grand Slam pinball machine. (Bally Midway, 1983)