Which movement ?

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Gstp

·Apr 30, 2020

Been looking at Ranfft but cant tell. Anyone care to help I'd be pleased.

 

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Dan S

·Apr 30, 2020

I would guess cal 23M or 27M. What is the size of the movement?

 

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Gstp

·Apr 30, 2020

A bit hard to measure excactly, bit more than 23 mm

 

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Dan S

·Apr 30, 2020

Gstp

A bit hard to measure excactly, bit more than 23 mm

OK, I guess that answers it, since it's apparently not 27mm. Should be quite obvious from Ranfft. You can also ask the Longines archive folks, assuming they're working.

 

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DirtyDozen12

·Apr 30, 2020

Even without the measurement, it's a 23M.

 

R

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rondeaux

·Apr 30, 2020

DirtyDozen12

Even without the measurement, it's a 23M.

Agreed. The alignment of the click and the case screw give it away for me.

 

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Gstp

·Apr 30, 2020

Didnt see one with the same regulator

 

R

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rondeaux

·Apr 30, 2020

Gstp

Didnt see one with the same regulator

Here's a few with the same regulator:

https://forums.timezone.com/index.php?t=msg&th=1031044&rid=0


http://chronocentric.com/forums/chronotrader/index.cgi?md=read;id=83844


These regulators seem to appear more often on the 23M center-seconds variant like the one above. I couldn't tell you what the technical difference of the regulator is though. Maybe someone more knowledgeable could chime in.

 

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Dan S

·Apr 30, 2020

Different regulator, different shock protection. It's the same movement.

 

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Gstp

·Apr 30, 2020

Dan S

Different regulator, different shock protection. It's the same movement.

Is that an age sign, quality or neither or something else

 

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Dan S

·Apr 30, 2020

We are talking about an era where shock protection was becoming more common, so earlier movements are more likely to be unprotected, and after a certain point nearly all Longines movements had shock protection. But there may also have been a transitional period where shock protection was selectively added to higher end watches. I haven't made a detailed study of it.