Mystery components!

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While picking out interesting vintage diodes at the electronics flea market, we came across a couple of components— possibly also diodes because of where we found them —of types that we have never seen before.  And we can’t resist a good mystery.

 

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First, there’s this little two legged can, marked with 650, a black dot, and CO on one side. The other side (as you can see in the photo above this one), is marked T 1 and has black and red dots.

 

Secondly, a couple of things that look kind of like resistors:
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They are very small, only about the size of 1/4 W resistors.  They are marked with a red capitol letter “P” and a set of four colored stripes. The “P” marking interrupts the three narrower bands in both cases.

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Here’s a good look at the color bands: brown, violet, green, and then a broad yellow.  (We could be reading this wrong; is the broad stripe supposed to be read first?)

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This one has brown, violet, green, and then broad violet.

So, what are they?  We don’t actually know, but if you do, or if you have a good guess, we’d love to hear it!