Winding stems    Balance staffs    Mainsprings

Landeron setting lever spring

It fits all following calibers :

47 48 51 54 55 82 85 86 148 149 151 152 153 154 155 180 181 185 186 187 189 203 248 254 349

Ressort de tirette

Part 445

Neuf de stock / New old stock