Pocket Watch Mainspring Advice Needed

[wls1971]

Hi,

 

I have a Cyma calibre 777 pocket watch that requires a new mainspring I have looked up the movement on the Ranftt site, and the main spring is listed as a ZF3308 and the dimensions are as follows H 1.80  0.18 L 450mm and barrel diameter of 15.0. I cant find the exact mainspring on the cousins web site but Obsolete Watch and clock list the following mainsprings 1.80 x .18 x 430 blue steel swiss or a 1.80 x .19 x 450 blue steel swiss ebee. My question is are either of these mainsprings suitable as a replacement and which one would be the best option.

 

Wayne

[clockboy]

Providing you don,t go over in height or strength then is should be Ok. If it is shorter it will just not have as much standby time.

If too strong it causes other issues so always best to go just under.

[wls1971]

Providing you don,t go over in height or strength then is should be Ok. If it is shorter it will just not have as much standby time.

If too strong it causes other issues so always best to go just under.

Right many thanks the 1.80 x .18 x 430 it is then,

 

Wayne