Characteristics Of A Mechanical Watch; Names Of The Parts - Seiko Presage SPB305 Instructions Manual

CAL. 6R21, 6R24

CHARACTERISTICS OF A MECHANICAL WATCH

(self-winding type, automatic winding type)
● This mechanical watch operates using power obtained from a mainspring.
● If the watch is completely stopped, manually turn the crown approximately 0
times to wind up the mainspring to start the watch.
● While loss/gain of a quartz watch is indicated by a monthly or annual rate, ac-
curacy of a mechanical watch is normally indicated by a daily rate (loss/gain per
day).
● Normal usage accuracy of a mechanical watch varies according to conditions of
use (time period that the watch is worn on the wrist, temperature environment,
hand movement, and winding state of the mainspring).
● When the watch is affected by strong magnetism, it temporarily gains or loses
time. If the watch encounters a strong magnetic field, the parts of the watch may
be magnetized. In this case, repairs such as removal of magnetism are required.
Contact the retailer from whom the watch was purchased.
4

NAMES OF THE PARTS

Hour hand
Power reserve
indicator
Second hand
CROWN
a) Normal position : winding up the mainspring (manual operation)
b) First click position : day and date settings
c) Second click position : time settings
* The position or design of the displays may differ depending on the model.
[Caliber 6R21]
Minute hand
Day
AUTOMATIC
CROWN
a b c
Date