waltham up/down

why do I see lossier hairspring on some movements and not on others did they stop inscribing at a certain date in time --thanks bob

Robert, the "Lossier hairspring" has been wound so the innermost coils have a larger helical spiral to allow more symmetrical compression/decompression of the intermediate coils when the balance wheel spins.

This change to the Model 1908 movements was added sometime in the 1930's or so. Earlier W.I. Walthams (were just as good) did not have this added "tweak' of the Hairspring.

I'm just now breaking one such Vanguard Indicator down, and I were wondering about that meself.

Separately, I've been warned NOT to lose anything, but especially the up/down hand.

kh

Ken,

Just take your time. You won't lose anything. If you do, just get out your magnet!

William

Heh, thanks William.

I think you should bring the family down thru the tunnel one of these days soon.

ken

Ken,

We'll plan it asap! Thanks!

William