Nice Rolex Precision ref. 12835, made in England in the 40s
9K solid gold, around 34mm case very well preserved with light use marks but no damages or dents. 
Case back is engraved with serial number 393.XXX dating around 1946, has the reference and the gold hallmarks clearly readable.
Crown with no logo, probably a later service replacement.
Sought after 3-6-9  "Explorer dial" in very good condition with a nice ivory patina. 
The hand winding movement has been checked and adjusted and has a good timekeeping and amplitude.
No box or papers. New leather strap not Rolex.