This is a reproduction hinge.

R51/2 used a rear fnder with a 5 lip hinge and welded cove for the driveshaft

R51/3 from VIN 522 001 to 536 001 

R67 all

R67/2 from VIN 612 001 to 615 547 

R68 from VIN 650 001 to 651 304

On these  motorcycles, 3 versions of rear fenders can be found:

- 5 lip hinge with welded cove

- 3 lip hinge with welded cove

- 5 lip hinge with bolted cove

R51/3 from VIN 536 001 

R67/2 from VIN 615 647 

R67/3 all

R68 from VIN 651 304

These motorcycles had a 3 lip hinge with bolted cove.

An exception may be some R51/3 motorcycles that have been fitted with a 5 lip hinge with bolted cove