Don't let anybody try to "restore" your dial, they are enamel, basically hand fired glass, over a copper base and cannot be re-enameled or repaired. Even the lettering is geletin transferred black glass dust, again hand fired, it can't be fired again. There are damn few out there who can do a decent job of these dials and lots who think they can but will only mess it up. Archer is right, there are ways to clean the cracks out a bit, but I'd leave well enough alone. The enamel won't degrade any more as long as its left alone...
Its a beautiful watch, get it serviced properly, run it regularly, wear it and enjoy it You'll find that a 992B in decent shape will perform as well as any COSC chronometre. These were working watches, meant to run inside 30 seconds a week for years in a dirty steam engines cab, that makes them better than a lot of fancy COSC dress watches in my books.
And here's you porn for tonight, the 992B's older brother.... the 992, this one from 1908.
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