Antique Watch Cases in Switzerland by: David Sperling
Borel & Candevaux cannot be found either in any of the books on watches, nor in the Clock and Watch Trademark Index of European Origin by Karl Kochmann.
The closest I can come to what you are looking for is the firm of Borel & Courvoisier. That firm made both watch movements and watch cases in Neuchatel, Switzerland between 1880 and 1897.
The Philip Borel that you see inscribed into the watch movement carries the name of an earlier watchmaker, Amedee Philippe Borel (1818-1887) who worked in Paris. Both the Borel (also Borrell) and Courvoisier families have a long history of watchmaking going back to the late 18th century. The families worked at various times in both France and Switzerland.
The firm of Borel & Courvoisier was followed by Ernest Borel and Company in 1898, with trademarks added in 1902,1903, 1904, 1910 and 1912.
The diamond shaped mark with "250" inside would be the Swiss Hallmark for 6 carat gold (either white or yellow). I am not sure about the N with an arrow, but it might well stand for Neuchatel where the watch was created.
