Seiko 2505 Movement Details

Seiko caliber 2505 is an automatic watch movement produced in the 1960s.
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Sub-brands: Seikomatic Lady
Day / date?Date only
GMT / world time?No
Chronograph?No
Rate:19,800 bph
Number of jewels:21
Lift angle:49º
Size / diameter:17.2mm
Height:5.5mm
Stem code: 351251, 372250 (movement side), 373250 (crown side)
Balance wheel code: 310250
Mainspring code: 401030
Screw codes: 012118, 012120 (dial screw), 012121 (stud screw), 012204, 012241, 012251, 012252, 012407 (case screw), 012501, 012642, 012711 (screw for oscillating weight), 012717, 012718, 012744
Development division:Daini (Kameido, Tokyo)
Notes:Used in ladies' watches. The same as cal. 2501 but with date display.
PDF guides: Technical guide for 2505A
Related movements: 2501