How do I convert Lignes to Calibres??

[Seth]

Hi there all,I hope you are all keeping safe and well during this tough time.Can anyone help me with a problem I have.I want to purchase a replacement mainspring for an Ingersoll Trench Watch but on looking at websites I am asked for the Caliber of the watch.The only measurements I have are 34.75mm across the movement or 16 Lignes with my gauge can anyone tell me how I get the Caliber size of a movement from the above measurements?? Any help would be gratefully received,Regards to all and keep safe,Seth.

[oldhippy]

Here you go. Use this link. You have two options French or Swiss. 

https://www.convertunits.com/from/ligne/to/caliber

 

[JohnR725]

2 hours ago, Seth said:

replacement mainspring

probably best to just take out the old mainspring measure the size and see if you can find something equivalent.