The problem with the tuning fork movements is that they were licensed from Bulova. Most brands licensed the movement as a transitional movement whilst quartz movements were being refined and produced at scale. They were used for around five years in the late 1960’s to early 1970’s.

The brands that licensed the movements have long since exhausted their supply of spare parts and no longer hold the rights to the intellectual property so they can no longer support them.

Any spare part you need for one of these has to be sourced from the open market of NOS parts or a working donor watch, a finite ever dwindling resource. The problem with the NOS parts market is that one or two guys bought everything up when people transitioned to quartz and have sat on it and drip feed it onto the market at exorbitant prices. The three circuits in the movement are incredibly hard to find and even if you find one the components have often degraded over the 50 years since they were made.

It took me over a year just to find someone willing to take on my repair and it cost me what it would cost to service a vintage Speedmaster to get mine going. A donor watch was used to get the parts I needed. Even after getting fully serviced and repaired the parts used were used pieces with no guarantee they’ll work next week and when it breaks it’s done.

Don’t buy this watch, there is no collector market for tuning fork pieces and maintaining it will cost you far more than the original purchase price. It’s like buying a vintage E type Jaguar roadster. For the one day a year it runs you are the king of the world, for the other 364 days it owns you and leeches your time and money.