JeanRichard vintage watch.

JwRosenthal

Are you looking to buy or have you already bought it? If priced right, it’s an attractive watch and a clean-up would make it fabulous. Size is also a factor on these older ones.
Case is honest and looks sharp, crystal would just need a wet-sand and de-gunkified- will be a looker

JwRosenthal

Let a watchmaker take it apart. The only cleaning that should be done on a dial is using rodico (although many watchmakers will disagree as rodico can leave residue) or the Bergeon sticky swabs (a gel type swab that you dab on the surface to lift grime but doesn’t abrade or leave a residue).
There are many threads online about magical cleaning techniques (like the lemon juice trick) but I can tell you from personal experience that it may work once, but will more than likely destroy the dial (yes, I destroyed a Seamaster dial after getting my confidence up saving a cheap watch dial…I will never do that again). There are a few wet swab tricks to spot cleaning, but it requires skill, experience and nothing to lose on the watch owners part- you roll the dice when they get into cleaning dials.
I personally can’t stand any patina on a dial. But some love it. If you are like me, then sell the watch as-is to someone who will love it as is.

Dan S

Rare, but not particularly valuable IMO.