First transparent ramp?

[invitro]

So while playing Space Shuttle and Haunted House in the tournament, I started wondering when ramps changed from always being opaque plastic or metal, to the transparent plastic.

The oldest table I could find with a transparent ramp is Comet (May 1985). I looked at most of the high-production Williams, Bally, and Gottlieb games between Black Knight and Cyclone, but may have missed several.

I'm curious if there are any before Comet.

 

[Dedpop]

Xenon ?
But is it a ramp ?

 

[invitro]

Xenon ?
But is it a ramp ?

Well it's a return from a ramp, and it goes over playable areas (a lot of the earlier ramps didn't).

Thanks, I didn't even think about Xenon!