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.
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.
As on conventional constructions, the center minute wheel is beared under an own cock.
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.
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.
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.
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
|Size:||12''' (measured: 27,0mm)|
|Number of jewels:||17|
Nickel anular balance|
|Balance bearing / direction hairspring:||Counterclockwise|
|Adjust mechanism:||Hairspring key|
|Construction type:||solid construction|
|Winding mechanism:||yoke winding system|
|Setting lever spring:||2 hole(s)|