B18

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The Beijing SB18 series is a 19,200(?) bph, 17 jewel, 3/4 plate hand winding movement, with hacking and hand-winding. It is based on the Miyota 8200 series, with the automatic winding deleted, and a good number of other changes. The original version used the same mainspring barrel retention mechanism of the auto-winding mechanism.

The initial version SB-18 was replaced by an improved version B18-6 with the following main changes:

  1. The seconds (fourth) wheel moved from 4/5 o'clock to 6 0'clock position, allowing direct drive of the seconds hand, avoiding the "jumping seconds" effect.
  2. The winding mechanism is replaced by a classic he classic hand-winding barrel retention mechanism, improving the reliability and feel of the hand winding.
  3. Support for date function.

In addition to many minor changes, the B18-6 can be regarded as a design of its own.

Some specifications of the B18-6:

  • Number of jewels: 18
  • Diameter 26mm
  • Thickness 4.01mm
  • Time-keeping duration 42 hours
  • Precision -10~+25 seconds
  • Number of parts 158
  • Features gold chaton; single swan neck fine regulator