TECHNICAL GUIDE
Cal. 8T63A
10/19
●
How to find the correct parts, if not determined by 4 digit caliber number
Following parts are determined based on the design of watches, such as hands height, dial
color, and design of cases. Please refer to the SEIKO WATCH PARTS CATALOGUE in order to
choose corresponding parts.
3
DATE DIAL
0878***
59
WINDING STEM
0351177
*
For screw down crown models, the stem is assembled to the crown and is not available
separatelly
7
SMALL HOUR HAND WHEEL
8
HOUR WHEEL
16
SWITHCH SPRING
22
SECOND COUNTING WHEEL
24
MINUTE COUNTING WHEEL
49
CENTER WHEEL AND PINION
56
SECOND WHEEL
Please refer to the following table in order to find the correct part number of each wheel
according to the hand installation height. The numeral 2 or 4 is printed on the DIAL.
7 SMALL
HOUR HAND
WHEEL
8 HOUR
WHEEL
16 SWITCH
SPRING
22 SECOND
COUNTING
WHEEL
24 MINUTE
COUNTING
WHEEL
49 CENTER
WHEEL AND
PINION
56 SECOND
WHEEL
2
0157012
0273038
4250091
0888028
0902017
0221087
0240018
3
0157012
0273041
4250092
0888027
0902017
0221091
0240018
4
0157013
0273042
4250093
0888029
0902018
0221092
0240019
