Identification stamp dati 3900 > Type B
Months (e.g. Dec.) connected with type C (displays e.g. Dec. 22), complete stamp
- Body for adjustable insert
- Adjustable insert with screw slot, for adjustment and to change the insert
- Fitting thread
- Clamping unit for infinite locking of the adjustable insert
- Material for sleeve and adjustable insert: 1.4034, hardened HRC 56 ± 2 stainless
- Inscription laterally reversed