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That's a nice looking amp....never seen one of those before which makes me think it's not super common. You may have to buy a dead one for a parts donor. It's also possible that the switch was used in other gear as well. Is there a part number on the switch that you can try and cross-reference? Also if you remove the switch from the amp and get a good clear picture of it, you could plug that into Google image search. I've had surprising success with that a few times.
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