G'day,
admittedly, itīs my very own and very niche field of interest
But iīm so fascinated i canīt help but throw in some more details and pictures.
Gold screws on the bimetallic balance.
Escapement section and gear train. The caps for escape wheel and anchor are flat (black) polished. The anchor itself is apparently polished out on the outer edges, which will reduce weight and inertia (in order to achieve a softer impact). The wheels come with a fine circular graining and reduced diameter of the spokes, which are bevelled. The bridges do have a fine and "sharp" anglage.
All pivots are very thin in order to minimize friction (which makes it fragile, as they are apt of breaking due to shocks).
Here the bimetallic construction of the Guillaume balance is quite visible; itīs made of nickel-steel. During the 1950īs, a variety of competition movements was submitted with Glucydur balances, some of them with flat hairsprings often by Nivarox. In the 1960īs there has been a trend towards Guillaume balances again, since they seem to be more reliable and allowed for better adjustment.
On the outer right edge, the barrel wheel and click wheel come with polished teeth.
A different perspective; the steel parts appear black due to the flat polishing. The "home grown" appearance of the regulation parts make me suspect itīs a one-off. The fine anglage and the polishing of the countersinks make a nice effect; these are almost the only decorative elements.
Balance wheel and bridge (the jewel is reflected in the steel cap).
"sunray" graining on the barrel wheel and klick wheel, with the inner area of the barrel wheel black polished. While itīs a nice visual effect, it does have a technical benefit as the graining tends to hold oil drops and the inverse curve of the polished parts will cause oil to creep towards the center.
One can spend a lot of time with these things
Greetings from germany,
Peter
