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Watch Database

Hamilton 721

*

Jewels: 17

Power Reserve: 36 hrs

Frequency: 18000 vph

Type: Manual Wind

Period used: ~1945

Size: 12.6 x 21.05 mm

Height: 3.25 mm

Hands: 1.00 x 0.50 mm

Balance Staff Listing

Ronda Reference #	Shock System
1220	Ordinary/None

Mainspring Listing

Dimensions	GR Reference #	End Type
1.00 x 0.090 x 260 x 8.0 mm	GR2428T	T

Parts Listing

Part Description	Reference #	Alternate	Discontinued
BALANCE	111530/HAM	111530/HAM	Yes
BALANCE COMPLETE	113570/HAM	113570/HAM	Yes
BANKING PINS	313440/HAM	2990A/HAM
BARREL AND CAP	115530/HAM	115530/HAM	Yes
BARREL ARBOR	101530/HAM	101530/HAM	Yes
CANNON PINION	319530/HAM	2929A/HAM
CENTER WHEEL STAFF & PINION	639530/HAM	2945B/3245/HAM
CLICK	167530/HAM	2919/HAM
CLICKSPRING	565401/HAM
CLUTCH	174530/HAM	174530/HAM	Yes
FOURTH WHEEL & PINION	661570/HAM	3250/HAM
GUARD PIN	315440/HAM	24122/HAM
HAIRSPRING	579571/HAM	579571/HAM	Yes
HAIRSPRING COLLET	182530/HAM	2965/HAM
HOUR WHEEL	663530/HAM	2941A/HAM
JEWEL, LOWER CENTER	241530/HAM	2968A/HAM
JEWEL, UPP/LOW BALANCE H7.75	236571/HAM	6278/HAM
JEWEL, UPPER CENTER	241572/HAM	2967/HAM
LEVER, SETTING (DETENT)	290530/HAM	2922/HAM
MAINSPRING 1-12-9 TBRACE	MS-JA230	GR 2428-T
MAINSPRING 1.00 X .08 1/4 X 10	36434/HAM
MINUTE WHEEL	677530/HAM	2942/HAM
PALLET ARBOR	103440/HAM	2934/HAM
PALLET FORK & ARBOR	307530/HAM	307530/HAM	Yes
RATCHET WHEEL	683530/HAM	2907A/HAM
ROLLER, COMBINATION 1.83MM DIA	350270/HAM	350270/HAM	Yes
SCREW, SET LEVER	468530/HAM	468530/HAM	Yes
SET WHEEL	686530/HAM	2916/HAM
SPRING, SET CAP (SET BDG)	591530/HAM	2940/HAM 721
STAFF, P 7	22BB/73	607570/HAM
STEM	614530/HAM	2926/HAM
STEM, OS HUB	614531/HAM
STUDS, HAIRSPRING	619530/HAM	3266/HAM
THIRD WHEEL & PINION	690570/HAM	690570/HAM	Yes
WHEEL ESCAPE	657570/HAM
WINDING PINION	331530/HAM
WINDING WHEEL	695530/HAM	2908A/HAM
WINDING WHEEL HUB	219440/HAM	5010/HAM

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