You have a helluva stash of parts, Bob!
The Brits liked those "fine wire" plugs shown in your third photo. Ive seen them on Ferrets and an FV432. Like David said, the pins are platinum or ididium and they are a high-end plug for aviation use. Good for burning off lead deposits, which I found out aviation gas still has, much to my surprise.
Nowadays they cost over $100 each, so $1000 for a four-banger aircraft engine! Total overkill for a museum vehicle.
Malcolm
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