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Waltham 645 21j Mainspring "Click" to Login or Register 
IHC Member 2264
posted
Good evening to you all, I have just joined and can't believe how much information is here.
I own a Waltham 645 serial : 19034455 and whilst winding it up 2 weeks ago I heard a whirring noise and there was no tension left as I wound.Suspecting that the mainspring had broken I removed the barrel to check.The mainspring had broken where the loop attaches to the arbour.
My question is : Is this dark blue/black spring likely to be the original mainspring ?
Regards ..... Gary

Mainspring
 
Posts: 19 | Location: London in the United Kingdom | Registered: August 12, 2018
IHC Member 2264
posted
Oh and this is the watch ...... It is one that I wear most days to work.
I bought it on the infamous auction site about a year ago for £52 (Approx $66). It keeps very good time and had never let me down until the mainspring broke.
Regards ..... Gary.

Waltham 645
 
Posts: 19 | Location: London in the United Kingdom | Registered: August 12, 2018
IHC Member 456
posted
Hi Gary, I don't think that there is a way to tell if the spring is the original one, as there are still new old stock blue mainsprings around today that could have been installed at any time.
Mike
 
Posts: 541 | Location: Mohrsville, Pennsylvania U.S.A. | Registered: February 15, 2005
IHC Member 2264
posted
Thanks for the reply Mike.
I did think that it may have been replaced before but I suppose there's no way of really knowing.
I fitted a new mainspring today, a silver coloured spring and the watch is now running again.
The mainspring I removed feels very weak & flimsy when compared to the new one.
Here's hoping.
Regards .... Gary.
 
Posts: 19 | Location: London in the United Kingdom | Registered: August 12, 2018
IHC Member 1555
posted
Those 645 Grades are the perfect workhorse Gary, great to work on and nice to carry.
 
Posts: 2184 | Location: Gladstone in Australia | Registered: January 14, 2011
IHC Member 107
Picture of Brian C.
posted
Gary, you did the right thing replacing a steel m/s with a white alloy unbreakable one, especially where you wear it everyday.
 
Posts: 1857 | Location: Epsom, New Hampshire USA | Registered: December 14, 2002
IHC Member 2264
posted
Thanks everyone.
The 645 has been running all day with the new spring. It is gaining approx' 2 minutes an hour at the moment, I'll let it run fully down then wind again.... do this a few times and see how it settles.
Regards ..... Gary.
 
Posts: 19 | Location: London in the United Kingdom | Registered: August 12, 2018
IHC Member 1555
posted
Is that 2 mins an hour Gary or 2 minutes a day. If it is 2 minutes an hour it is not going to come good, I would be have a close look at the watch to see it something is amiss.
 
Posts: 2184 | Location: Gladstone in Australia | Registered: January 14, 2011
posted
quote:
e mainspring I removed feels very weak & flimsy when compared to the new one.Here's hoping.


Maybe the new spring is too strong for the movement.
 
Posts: 42 | Location: Manitoba in Canada | Registered: December 05, 2014
IHC Member 2264
posted
Thanks for the replies.
I let the watch run down and then wound fully over the weekend.
Then, this morning, at 7am I wound the watch fully and set the time to a quartz watch I own. I've just checked the time after 15 and a half hours and it has lost approx' one minute so looking fairly good.
And to celebrate I've just bought a new waistcoat to wear the watch with .... Just got to get my son to make a new button hole for the watch chain.
I'll keep my eye on the time keeping for the next week, so here's hoping it will hold up.
Regards ....... Gary.
 
Posts: 19 | Location: London in the United Kingdom | Registered: August 12, 2018
IHC Member 2264
posted
Oh and thanks for your input Bila,
I got the details wrong big time there. Eek
Regards .... Gary.
 
Posts: 19 | Location: London in the United Kingdom | Registered: August 12, 2018
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