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I've got a considerable pile of WW II RF stuff Dad bought on Radio Row (Cortlandt St, torn down to build the World Trade Center) in NYC after the war. I don't recall ever seeing a silver plated coil that was tarnished, so I must presume that there was some coating applied over the silver.
Switches and such are commonly tarnished.

One of my winter projects is to move and inventory the pile so I'll try to remember to take some pictures. If anyone is interested in buying such stuff send me a PM. Dad bought cases of really high quality parts. I need to sell this stuff off as it exceeds anything I could ever use up.

The high power RF stuff is amazing. Steatite coil forms and silver plated wire. Very bulky, but it had to be big to allow the high voltages. The tubes in the standard B-17 radios had a 1500 V plate rating!. These have become *the thing* for audiophool amplifiers and the tubes sell for $300-400 each. Dad left me 23 of those tubes :-)

For anyone interested in tube stuff, I've got a rather large quantity of a tube which is basically a 6L6 with a 3 V filament in addition to a lot of other well chosen general purpose tubes. So if you want to make an Ameco AC-1, my only station transmitter, it's a bargain relative to a 6L6.

Thanks for posting. I'm currently struggling with writing some comments about the QEX WSPR QRN paper in the 9-10/20 issue. I'm very intrigued by the work, but not entirely sure I know enough about the ionosphere yet. My career was spent looking down, not up.

Have Fun!
Reg