Landeron balance cock cal. 51 (first generation 1947) / Coq / part 121 (regular)

Landeron 51 regular balance cock / Coq pour Landeron 51 première génération (1947)

For Landeron 51 first generation (1947) regular, not for incabloc

The distance between the 2 pivots must be 5.07mm, this is different with the second generation.

Part 121

Pre-owned / Pre-used