Jaeger Lecoultre 889 889/2 balance cock (jewel is missing)

Jaeger Lecoultre 889 and 889/2 balance cock / pont de balancier

Also ok for Audemars Piguet 2124 , Vacheron Constantin 1126 , IWC 3254

No jewel / without jewel (see pics)

Pre-owned / pre-used