It doesn't appear to be and I would suspect it would be a poor choice of material for such a functional part. Typically they are nickel-plated brass, and one that is 'yellowish" in colour could be due to thin plating. (This one looks yellow, but not all y...
en.worldtempus.com "A particularly hard white gold alloy is accordingly used in this escapement assembly for the pallet fork and the escape wheel." But it doesn't sound like they do it because it's a good material, but because they just toss the w...
I had a moser with gold escapement. But I noticed that some movements with same model don't have gold escapement. And the double hairspring as well. It seems like H.Moser uses gold escapement and double hairspring randomly on their movement? ...