Re: Any other plug collectors out there?
As mentioned elsewhere one classic brand (type) that arguably needs discarding when it comes of age, is Duraplug (rubber). Terminal decline can sometimes be detected by distortion of the actual body of the plug, but long before this enough sulphur will have leached out to turn the silver plated parts black and the brass parts brown. It can be polished out of course but it's not a good sign.
Dave
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