Seiko 8R48A, Technical Manual

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●
Location of the jewels
Upper Lower
Cap jewel Hole jewel Cap jewel Hole jewel
77 FORTH WHEEL
- ○ - -
78 THIRD WHEEL
○ ○ - ○
84 ESCAPE WHEEL
○ ○ - ○
81 CENTER WHEEL
- ○ - ○
66 2ND REDUCTION WHEEL
- ○ - ○
- ○ - -
74 1ST REDUCTION WHEEL
- ○ - ○
12 INTERMEDIATE DATE WHEEL
- ○ - -
22
MINUTE COUNTING 2ND
INTERMEDIATE WHEEL
- ○ - ○
23
MINUTE COUNTING 1ST
INTERMEDIATE WHEEL
- ○ - ○
25 HOUR COUNTING WHEEL
- - - ○
24 MINUTE COUNTING WHEEL
- - - ○
43 SECONDS COUNTING WHEEL
- - - -
44 SECONDS WHEEL
- - - ○
47 CHRONOGRAPH WHEEL
- ○ - ○
60 BALANCE COMPLETE (WITH STUD)
○ ○ ○ ○
63 PALLET FORK
- ○ - ○
ENTRY PALLET JEWEL
○
EXIT PALLET JEWEL
○
ROLLER JEWELS
○
TOTAL NUMBER OF JEWELS
34 jewels
BALANCE AND
ESCAPEMENT
GEAR TRAIN
MECHANISM
WINDING
MECHANISM
CHRONOGRAPH
UNIT
CROWN WHEEL (Assembled to the
BARREL AND TRAIN WHEEL BRIDGE 70
PARTS CATALOGUE
Cal. 8R48A/8R49A
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