Buying A Watch Tool Kit And Fitting A Sapphire Case Back To A King Seiko 44-9990
This article details the author's experience purchasing a watch tool kit and subsequently fitting an aftermarket sapphire display case back to a vintage King Seiko 44-9990. The modification aims to showcase the manually wound 44A movement, transforming the ownership experience and fostering a deeper connection with the watch.
The King Seiko 44-9990 is highlighted for its historical significance in Japanese watchmaking and its adherence to the brand's Grammar of Design philosophy, featuring sharp lugs, mirror-polished facets, dauphine hands, and a silver dial.
The manually wound 44A movement is described as having warmth and personality, with a straightforward mechanical design and a slower 18,000vph beat rate.
A basic watch tool kit is recommended to include a spring bar tool, case holder, microfiber cloths, case back opener, tweezers, finger cots, and a dust blower, with a soft movement cushion also being useful.
For vintage watches like the 44-9990, investing in individual quality tools such as a Jaxa-style case back opener, a reliable case holder, and quality screwdrivers is advised over the cheapest all-in-one kits to avoid damaging the case.
The original screw-in case back on the 44KS is acknowledged as lovely, often featuring a gold medallion, and the aftermarket sapphire display back from The Time Collective is noted as a reversible modification that does not permanently alter the watch.
The installation of the aftermarket sapphire case back involves ensuring the gasket is clean and correctly seated, and the display back threads smoothly into place, emphasizing patience to avoid cross-threading the vintage steel threads.
Fitting the sapphire display back transforms the watch into something more interactive, making the wearer more conscious of the mechanical life inside and enhancing the emotional rhythm of ownership.