Also, you should show a photo of where it came from (and describe what the board is from). Such context is important to be sure the response is correct...
Also, it appears working does it not?
Probably a Zenner.
Could be.. I thought maybe the color code was brown-yellow-gray, 148, i.e. maybe 1N4148, but I've not seen that before.
Anyway, hopefully photo(s) can make it clearer, or some context.
Yes, 1N4148.
