This is an original bullet racing mirror with 3" base and 4.5" flat mirror glass.  These were fitted as accessories to many British sports cars in the '60s and '70s and were fitted from the dealer to the doors of some late TR6s.  This particular example is off of a TR4.  If you just goofed and broke one of your old mirrors, it your lucky day!  No need to worry about a brand new repro looking out of place with this used but fully functional example.

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