Rare vintage V.T.F Pocket Watch Crystals by Verrerie des Trois Fontaines a 19th century French glass making company. 

Crystals are sold individually but are packed in sets of 3.

Refer to last photo of listing to determine how to convert sizes to millimetres. If you need help, please message me and I will do my best to help you convert the size(s) you are looking for. 

Crystal type: Mi-concave 
Country of manufacture: France
Circa: 1900-1940's

PURCHASE 6 OR MORE AND SHIPPING IS FREE

If you have any questions or if you would like to see any addition photos, please don't hesitate to ask.