Sizing A Goliath Pocket Watch Hairspring

[Dave84]

Hi Everyone

I hope you are all keeping well.

I picked up this Goliath pocket watch this morning as a restoration project but the hairspring is missing.

Can anyone point me in the right direction regarding sizing/selecting a replacement. 

It also has a damaged staff to contend with

Thanks in advance for any advice.

Dave 

 

[oldhippy]

No id at all under the balance cock? If you remove the hands and dial and take photos of the key less work and upload them we might be able to help. 

[Dave84]

2 hours ago, oldhippy said:

No id at all under the balance cock? If you remove the hands and dial and take photos of the key less work and upload them we might be able to help. 

Nothing obvious under the balance but a 36, and what looks like 141854 under the dial side. Any good ? 

Edited February 13, 2022 by Dave84

[oldhippy]

Sorry I can't find anything in any books I have. A long shot you could look on ebay. 

[JohnR725]

It would help if we had a diameter of the pocket watch? Because any of the references we look at are going to ask the size and can't From the picture how big it is?

The balance staff is probably going to be a you get to make one.

Finding the hairspring that's going to be the interesting challenge. Problem with the early manufacturers of watches how many of them thought about stocking spare parts?

[Dave84]

11 hours ago, oldhippy said:

Sorry I can't find anything in any books I have. A long shot you could look on ebay. 

Thank you for taking a look for me . I really appreciate it . 

[Dave84]

8 hours ago, JohnR725 said:

It would help if we had a diameter of the pocket watch? Because any of the references we look at are going to ask the size and can't From the picture how big it is?

The balance staff is probably going to be a you get to make one.

Finding the hairspring that's going to be the interesting challenge. Problem with the early manufacturers of watches how many of them thought about stocking spare parts?

Thanks John

The movement diameter is 40mm. I did think that a new staff wold have to be turned for it. As for the hairspring, that was a concern as I didn't think there would be many spares out there for these things.

Cheers 

Dave  

[praezis]

13 hours ago, Dave84 said:

The movement diameter is 40mm. 

Sure? That is rather small and doesn't justify the name 'Goliath'!

Frank

[nickelsilver]

This list will give a ballpark size of the hairspring. You will of course have to attach it to the collet, and vibrate it (count it), attach stud, form the terminal curve etc.

 

 

[Dave84]

10 hours ago, praezis said:

Sure? That is rather small and doesn't justify the name 'Goliath'!

Frank

Apologies, I checked late last night and misread the measurement. It is in fact 55mm.  

[oldhippy]

That's more like it some are 60mm 

[Dave84]

19 hours ago, oldhippy said:

That's more like it some are 60mm 

i cant believe just how big and heavy the thing is.. i hope i can get it going again. Fascinated to hear the thing tick