Hi Ultra,
Your Uncle P38 looks very excellent condition.
I am afraid your scope sight is not “Uncle scope.”
It is usual “Pistol scope”.
MGC sold usual “Pistol scope” for Uncle P38 after stopped produce “Uncle scope”
MGC released Uncle P38 in 1966 before Military P38 because spy movie boom.
Real prop Uncle P38 had big grip panel that made of aluminum for fix scope mount base and metal stock.
Mr. Kobayashi designed Uncle P38 as tanio action with slim grip in order to pull trigger easily.
The grip panel was made of plastic material.
Scope mount base and metal stock were fixed on the main frame made of zinc.
MGC Uncle P38 had weak loading slope of chamber. It broke easily.
Military P38 that released in 1968 had reinforced loading slope.
Catalogue in 1970.
This picture was deleted scope mount top cap.
Catalogue after 1971.
It can not fix barrel extension because blocked barrel in Japan.
MGC released barrel joint.
Catalogue end of 70s.
Your scope is this type.