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Yes here is the underside. Wow I need to clean this wiring up I see.. Yes on the Sega Asteroids..Can you take a picture of under the control panel?
Trying to figure out if these are cinematronics buttons or not.
Cinematronics and Sega had some mingling where they made some Sundance cabinets in these Asteroids cabinets (i assume this is a sega asteroids)

Yup. Congratulations! Looks like you have a Sundance cabinet that was factory converted to Asteroids! You can tell by the grid layout under the Control Panel.
Read this link for more interesting info about that: https://arcadeblogger.com/2017/02/17/sega-sundance-unearthed/
So that button doesn't look like the ones that are on Cinematronics/Vectorbeam space wars and other games. See below picture.
These ones had to have their reed switches attached to a PCB.
View attachment 486741
Yours are a different model, so I'm guessing SEGA outsourced them.
Often I've looked at cash registers or control box PCBs for similar buttons. I found similar, but not correct buttons for the cinematronics ones. The closest I found were KeyTronics keyswitches... but those are rare and eaten up buy keyboard collectors. That's why I was thinking of making repros.
How do your key caps attach? That would probably be useful for trying to find a suitable replacement.
Click on the link for the cool story. There are some pics to check out.Always wondered what the Sega Asteroid cabs looked like. Can you post some pics? Especially of the marquee and control panel? Does the screen say Atari at the bottom?


They look the same, but the button caps are different. Honestly, I need one of the caps for my Subroc, too.FYI in case anyone else was using this thread for research, the buttons above look to be the same as some used on Sega Subroc— it seems like there have been many of those parted out because of the inability to source the 3D parts in the periscope. Maybe a little wider net for the next guy.