This vintage Magistral Super 6978TR mainspring is a rare find for horology enthusiasts and watchmakers. Marked with reference numbers 2.80 .18 and 640 17.

Swiss Made this NOS (new old stock) mainspring is an authentic watch part ideal for servicing or restoring vintage mechanical movements. Whether you're repairing a cherished timepiece or stocking up on hard-to-find Swiss components, this precision-crafted mainspring delivers the quality and reliability that defines mid-20th century watchmaking. Stored in its original packaging and ready for installation, this is a valuable addition to any watchmaker’s bench or parts collection.

The Magistral Super 6978TR mainspring, also known by reference numbers 2.80.18 and 640.17, is compatible with several vintage watch movements. According to an online database, this mainspring is used in the following movements:

• Citizen 4-675894

• Ebosa 701.230

• Gubelin 701821600

• Seiko 2620-5619

• Seiko V701-6030

• Sonceboz ES 5512

Additionally, similar mainsprings with slightly different specifications are used in movements such as the Waltham 1888 16/S and A. Michel PW MNSPRGS 14.95, which utilize mainsprings measuring 2.80 x 0.190 x 640 x 17.0 mm. These may serve as alternatives if exact matches are unavailable.

For precise compatibility, it's advisable to consult detailed movement specifications or a professional watchmaker. If you need assistance identifying the correct mainspring for a specific watch model, feel free to provide the movement or case reference number.

MAGISTRAL - SUPER - 6978TR 2.80 .18 640 17 - Swiss Made watch spring - watchmaker spares
sale is for one spring

PLEASE SEE PICTURE for description and specs