The attached image shows the desired type switch from a 1970 'survivor' Goose. I assume it's a SIPEA unit; maybe originally a FIAT 600 part. The perplexing part is the key's rounded shape. I thought the 'standard' OEM key was more of a polygon (shown in pic #2). Can anyone with an original key confirm or illustrate what the top of the key looks like? Maybe there were more than one style used? Is 'FIAT' evident on the original key, or perhaps 'SIPEA'?
By looking at old photos it's clear that a lot of original switches have been replaced with various alternatives. (I've seen smoked ignition terminals on more than one wiring harness so contact resistance may have been an issue). The classic Bosch switch seem to be the most common replacement. Thanks for any help, regards, Nate