Seiko 63A = Allwyn A6300

 
Seiko 63A = Allwyn A6300

Seiko 63A = Allwyn A6300

Description

In the early 1980s, the indial manufacturer Allwyn started a cooperation with Seiko and remounted in Hyderabad a few simple movements such as the Seiko 63A, which got the name Allwyn A6300 and was used in inexpensive watches.

The Seiko 63A was probably one of the most simple and inexpensive Seiko movements.

base plate

base plate

On the pretty large base plate with a diameter of 12 lignes, the outer edge was not used. Although being inexpensive, it was pretty well made, with all bearings containing synthetic rubies, even for the center minute wheel.

base plate with minute wheel

base plate with minute wheel

As on conventional constructions, the center minute wheel is beared under an own cock.

gear train

gear train

The Seiko 63A uses the classical gear train with mainspring barrel, center minute wheel, third wheel, center seconds wheel and steel escape wheel.

Probably for cost-cutting, the three reduction gears of the movements are massive with more or less large holes.

side view of the gear train

side view of the gear train

As regulator, a golden toned anular balance with four legs is used, which is beared in two Seiko Diashock proection bearings. It beats with 21600 A/h and is adjusted on the hairspring key only. As escapement, a swiss-type pallet lever is used.

inside the gear train bridge

inside the gear train bridge

The escape wheel is beared on the movement side with a plugged chaton, whose cap jewel is held in place by a Seiko inhouse Diafix shock protection.

Since there’s only one combined bridge for the gear train and mainspring barrel bearing, the ratchet is also part of it. Like the crown wheel, it is riveted and simple, but efficiently made.

Seiko 63A: Dial side

Seiko 63A: Dial side

On the dial side you see the yoke winding system and the preparations for a date indication.

Generally, the construction makes a rugged impression. Not really beautful and not haute horlogery, but made to last years or even centuries and to be repaired easily.

In the lab

The specimen shown here came in heavily used condition into the lab and got a simple service treatement, after which it was working pretty well with an amplitude of almost 250 degrees.

Technical data

Manufacturer:Seiko
Caliber:63A
Size:12''' (measured: 27,0mm)
A/h:21600
Number of jewels:17
Escapement:Pallet lever
Balance types: Nickel anular balance
Shock protection(s): Diashock (Seiko)
Balance bearing / direction hairspring:Counterclockwise
Moveable stud:yes
Adjust mechanism:Hairspring key
Construction:
  • lever
  • escape wheel, seconds wheel, third wheel, mainspring barrel
  • center minute wheel
Construction type:solid construction
Winding mechanism:yoke winding system
Setting lever spring:2 hole(s)
Features:
  • SCD (direct center seconds)
Inventory number:20032

Usage gallery

Allwyn gents watch

Allwyn gents watch