4 Speed Synchro Gearbox Number identification for 1972 P6 3500S

[Graham Hutton]

Whereabout on the gearbox is this number located ?
Have engine number A 48102143 from boss on back of engine but cannot see anything stamped on gearbox.

 

[harveyp6]

Should be on one of the ribs on the bottom of the main casing.

 

[Graham Hutton]

Thanks Harvey- will have a look.