How to read the sizing on landeron 148 mainspring replacement

[Max50916]

Hello! Forgive me if this is a stupid question, but I am quite new to this and am attempting to restore a Clebar chronograph with a landeron 148 movement. The mainspring is broken and needs replacing, and I'm having a hard time understanding the sizing system/compatibility markings on the packaging of a few potential replacements. I've seen some that say 48 and 148 mainsprings are interchangeable. Would either of these work? If so, how do I understand the reference numbers on the packaging "For Landeron 46.7.8.9  - .50  1.4.5..."etc

[Poljot]

3 minutes ago, Max50916 said:

Hello! Forgive me if this is a stupid question, but I am quite new to this and am attempting to restore a Clebar chronograph with a landeron 148 movement. The mainspring is broken and needs replacing, and I'm having a hard time understanding the sizing system/compatibility markings on the packaging of a few potential replacements. I've seen some that say 48 and 148 mainsprings are interchangeable. Would either of these work? If so, how do I understand the reference numbers on the packaging "For Landeron 46.7.8.9  - .50  1.4.5..."etc

Pick one system that you are comfortable with. Let's say metric.

Voila!

1.35 x .145 x 380 x 12 Non-Automatic

GR3530

334 In Stock

£11.95

EACH

[Max50916]

4 hours ago, Poljot said:

Pick one system that you are comfortable with. Let's say metric.

Voila!

1.35 x .145 x 380 x 12 Non-Automatic

GR3530

334 In Stock

£11.95

EACH

Thank you! I noticed that I would need to order this in from the UK but I'm excited to get started on this asap, would the ones that I posted the photos of work too?

[Poljot]

51 minutes ago, Max50916 said:

Thank you! I noticed that I would need to order this in from the UK but I'm excited to get started on this asap, would the ones that I posted the photos of work too?

They both appear to be "vintage" - I would rather get a new alloy mainspring from CousinsUK than try my luck with one of the older / vintage / new old stock mainsprings.

[watchweasol]

Hi Thee below is always a good reference,   attached is the page for the Landerton 148.

Jules Borel and esslingers  are good sources in the USA.

bidfun-db Archive_ Watch Movements_ Landeron 148.html

[Max50916]

5 hours ago, watchweasol said:

Hi Thee below is always a good reference,   attached is the page for the Landerton 148.

Jules Borel and esslingers  are good sources in the USA.

bidfun-db Archive_ Watch Movements_ Landeron 148.html 21.57 kB · 5 downloads

Thank you! I'd never tried Jules Borel and found it!, much appreciated!

[Poljot]

6 hours ago, watchweasol said:

Hi Thee below is always a good reference,   attached is the page for the Landerton 148.

Jules Borel and esslingers  are good sources in the USA.

bidfun-db Archive_ Watch Movements_ Landeron 148.html 21.57 kB · 6 downloads

It's no doubt a very good reference, but it's not always accurate. So, do your homework and compare different references. The good thing is that if you find an error, you can simply send email describing the issue, and it will be corrected fast. I did that in the past.

 

[watchweasol]

Unfortunatly with any compilations of data, human error is always a factor but on the whole the likes of Dr Ranfft do their utmost to be correct and I'am sure appreciate being notified should an error occur in order to correct any mistakes. They give very good guidence.  It is always best to cross reference any data with another source.      Measure twice  Cut once.    the old adage.