With Patek Philippe Extract from the Archives confirming production of the present watch with silvery opaline-white dial and applied gold hour markers in 1988 and its subsequent sale on 24 January 1989. The Extract further confirms the gold bracelet.
Ref. 3945/1 was in production from 1985 until 1998, and is a variant of the celebrated reference 3940. Whereas the case of reference 3940 features lugs in order to add a detachable leather or gold bracelet, reference 3945/1 was exclusively made with integral gold bracelet.
As its peer, reference 3945/1 was produced in two series, distinguished by the leap year display: the first series with sunk leap year dial, such as the present watch, the second showing a crossed leap year.