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Gruen 707 mainspring needed [message #5189] Sun, 01 March 2015 21:31 Go to next message
mikey
Messages: 742
Registered: May 2013
Location: Paris, Ontario
Gruen Master
Anyone have a new mainspring for a Gruen 707 they can sell me? '48 catalogue shows dimensions of 1.90 x .12.5 x 320. which i believe converts to 10 x 9.5 x 12.5 in Dennison size?

Doesn't appear to be interchangeable with any other model than the 7 jewel 713 (which i've never seen).


Time, even vintage time, goes too fast for my tastes.
Re: Gruen 707 mainspring needed [message #5198 is a reply to message #5189] Wed, 04 March 2015 21:56 Go to previous messageGo to next message
Thojil is currently offline  Thojil
Messages: 625
Registered: May 2013
Location: Arzier, Switzerland
Gruen Master
I checked my stock and I do have an original Gruen packaged one. The only concern I have is whether the spring is still ok. My experience is that 50% of these "new" old stock springs have lost their capacity and if you can find the same dimension new you're much better off. I most of the time fit new springs nowadays unless the dimensions are impossible to find.

Anyway I got one in case you want it.
Re: Gruen 707 mainspring needed [message #5199 is a reply to message #5198] Thu, 05 March 2015 02:05 Go to previous message
mikey
Messages: 742
Registered: May 2013
Location: Paris, Ontario
Gruen Master
PM sent!

Time, even vintage time, goes too fast for my tastes.
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