Turn signal flasher switch, as typically found on early classic Minis. Has three (3) spade connections. Aftermarket. Ref: GFU2103, SFB105, GFU103.
Flashers are not polarity sensitive. They are always wired in a mk1
Solid Green/Switched 12V - X
Green/Brown To switch/Lamps/Load- L
Green/Purple Dash/indicator light - P