| 968 / | HD | HOROLOGY |
| 368 | DD | WATCH CRYSTALS; FASTENING OR SEALING OF CRYSTALS; CLOCK GLASSES [G04B 39/00] {4} |
| 373 | DD | .~ Arrangements for sealing (sealing the case and winding stem subclass 327) [G04B 39/00K] {1} |
| 374 | | .~.~ Without special sealing parts [G04B 39/00K2] |