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SF240
Posted: November 8th, 2021, 2:51 pm
by Yoda
I once learned that there were four different types of the SF240 movement, but I think that I have found number five...apart from the ones from P******I.
The movement I am thinking about is a 1930s KW SF240 with narrow CdG and glucydur balance assembly....it has been in my cabinet for years and I once planned to create a KW wristwatch with the movement.
As far as I know the glucydur wasn't introduced until the MAI./JUIN. 61 movement.
I think that it made a crack in my world...
Re: SF240
Posted: November 8th, 2021, 3:13 pm
by straps68
Yoda wrote: ↑November 8th, 2021, 2:51 pm
I once learned that there were four different types of the SF240 movement, but I think that I have found number five...apart from the ones from P******I.
The movement I am thinking about is a 1930s KW SF240 with narrow CdG and glucydur balance assembly....it has been in my cabinet for years and I once planned to create a KW wristwatch with the movement.
As far as I know the glucydur wasn't introduced until the MAI./JUIN. 61 movement.
I think that it made a crack in my world...
Not trying to diminish your discovery or anything but is it not conceivable that someone replaced the balance wheel a long time ago thus creating what you have?
Re: SF240
Posted: November 8th, 2021, 3:17 pm
by Yoda
straps68 wrote: ↑November 8th, 2021, 3:13 pm
Yoda wrote: ↑November 8th, 2021, 2:51 pm
I once learned that there were four different types of the SF240 movement, but I think that I have found number five...apart from the ones from P******I.
The movement I am thinking about is a 1930s KW SF240 with narrow CdG and glucydur balance assembly....it has been in my cabinet for years and I once planned to create a KW wristwatch with the movement.
As far as I know the glucydur wasn't introduced until the MAI./JUIN. 61 movement.
I think that it made a crack in my world...
Not trying to diminish your discovery or anything but is it not conceivable that someone replaced the balance wheel a long time ago thus creating what you have?
I have no idea!
Re: SF240
Posted: November 8th, 2021, 3:19 pm
by straps68
Yoda wrote: ↑November 8th, 2021, 3:17 pm
straps68 wrote: ↑November 8th, 2021, 3:13 pm
Yoda wrote: ↑November 8th, 2021, 2:51 pm
I once learned that there were four different types of the SF240 movement, but I think that I have found number five...apart from the ones from P******I.
The movement I am thinking about is a 1930s KW SF240 with narrow CdG and glucydur balance assembly....it has been in my cabinet for years and I once planned to create a KW wristwatch with the movement.
As far as I know the glucydur wasn't introduced until the MAI./JUIN. 61 movement.
I think that it made a crack in my world...
Not trying to diminish your discovery or anything but is it not conceivable that someone replaced the balance wheel a long time ago thus creating what you have?
I have no idea!
I meant as in a question, as in would the movement run correctly? I suppose if the weight of the glycydur is the same as the other kind then it should.
Re: SF240
Posted: November 8th, 2021, 3:21 pm
by Yoda
straps68 wrote: ↑November 8th, 2021, 3:19 pm
Yoda wrote: ↑November 8th, 2021, 3:17 pm
straps68 wrote: ↑November 8th, 2021, 3:13 pm
Not trying to diminish your discovery or anything but is it not conceivable that someone replaced the balance wheel a long time ago thus creating what you have?
I have no idea!
I meant as in a question, as in would the movement run correctly? I suppose if the weight of the glycydur is the same as the other kind then it should.
It's pretty disturbing, it runs several days longer than a gen I have here....
It runs perfectly for 11 days.
Re: SF240
Posted: November 8th, 2021, 3:23 pm
by straps68
Yoda wrote: ↑November 8th, 2021, 3:21 pm
straps68 wrote: ↑November 8th, 2021, 3:19 pm
Yoda wrote: ↑November 8th, 2021, 3:17 pm
I have no idea!
I meant as in a question, as in would the movement run correctly? I suppose if the weight of the glycydur is the same as the other kind then it should.
It's pretty disturbing, it runs several days longer than a gen I have here....
Interesting. And it keeps correct time? Maybe it has a longer main spring to boot? Then it is really unique.
Re: SF240
Posted: November 8th, 2021, 3:24 pm
by Yoda
straps68 wrote: ↑November 8th, 2021, 3:23 pm
Yoda wrote: ↑November 8th, 2021, 3:21 pm
straps68 wrote: ↑November 8th, 2021, 3:19 pm
I meant as in a question, as in would the movement run correctly? I suppose if the weight of the glycydur is the same as the other kind then it should.
It's pretty disturbing, it runs several days longer than a gen I have here....
Interesting. And it keeps correct time? Maybe it has a longer main spring to boot? Then it is really unique.
Standard mainspring, serviced by me a couple of years ago.
Re: SF240
Posted: November 8th, 2021, 3:32 pm
by straps68
Yoda wrote: ↑November 8th, 2021, 3:24 pm
straps68 wrote: ↑November 8th, 2021, 3:23 pm
Yoda wrote: ↑November 8th, 2021, 3:21 pm
It's pretty disturbing, it runs several days longer than a gen I have here....
Interesting. And it keeps correct time? Maybe it has a longer main spring to boot? Then it is really unique.
Standard mainspring, serviced by me a couple of years ago.
I guess you did one hell of a good job then
Re: SF240
Posted: November 8th, 2021, 3:48 pm
by Yoda
straps68 wrote: ↑November 8th, 2021, 3:32 pm
Yoda wrote: ↑November 8th, 2021, 3:24 pm
straps68 wrote: ↑November 8th, 2021, 3:23 pm
Interesting. And it keeps correct time? Maybe it has a longer main spring to boot? Then it is really unique.
Standard mainspring, serviced by me a couple of years ago.
I guess you did one hell of a good job then
I was most likely lucky.