Montesa King Scorpion 250 34M NOS Speedometer Bracket Nut p/n 3480.209
 
nut is 10 mm, inside nut diameter is 5 mm.  
Montesa OEM part.  Bid is for one as seen in photo
May fit other makes and models, please verify that part number is correct for your application.

Condition is 10 out of 10.  1 Being worst and 10 being the best.

Location : P 201 Box 101/087 tbd