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I'd like to order several such bulbs, but I don't know its type, and it isn't written on the bulb itself.
I took a photo of it.
It has "3 legs" in its plastic cover.
Perhaps you are familiar with it?
Maybe contact the supplier of whatever it came from? I've been doing a quick internet search for them, came up with a few with gold bases but not that one.
It's possible the exact bulb you have isn't made any more, as the styles seem to change quite quickly.