Please help identify this component. It is cylindrical, with an axial configuration, and no obvious indication of which end is which. The writing on it is:
K25U
104M
50V
8502
The 104M makes me think it is a 0.1 uF capacitor, but, in my extremely limited experience, this is an unusual form factor for a capacitor. My googling for images of similar looking capacitors has turned up nothing.
Best Answer
I think your guess is right. From the code and appearance, it should be: an unpolarized, 100nF, ±20% tolerance (from the "M"), 50V capacitor. That form factor is not unusual for older capacitors, and the physical size makes sense for a 100nF 50V cap.
Also, if that "8502" is a date code, that would be January 1985!
To verify (or at least narrow down) whether it's a capacitor or not, you could check resistance in both directions. If there's no conductivity in either direction, it's very probably a capacitor. If not, then it's either a broken capacitor or something else entirely.
Edit: For completeness, a datasheet search for "K25U" turns up a couple things: