Citizen Hisonic tuning fork

[croolis]

I sold this watch last night, but posting a few photos here to document what is actually a very nice and rather uncommon Citizen model.

The movement in this one is, as far as I know, identical to an Accutron 218 to the point of all parts being interchangeable.
Sadly it didn't spring to life with a battery in place, my feeling is that it could be fixed but I don't have the tools to check it, and my feeling is that sending it to an Accutron specialist would cost a lot more than it's worth.

[sweephand]

You're right that the Bulova 218 is the same as the movement in this Hisonic, so parts are fully interchangeable. In fact Citizen made these movements under a licence agreement with Bulova - the movements are marked accordingly:




These are very nice watches imho, and were expensive pieces in their day. And the smooth sweep of the second hand is cool:



Stephen



 

[solex]

Very cool do they run through batteries

[sweephand]

Yep, battery operated. There is a small tuning fork which vibrates and that is turned into a rotational movement running at 360Hz:



Here's an authoritative article on this type of movement@

members.iinet.net.au/~fotoplot/acc.htm


Stephen

[solex]

I meant does it eat through batteries, my understanding is that the batteries need replacement every year but have yet to see one in person

[sweephand]

Oct 12, 2014 10:05:13 GMT -8 solex said:

I meant does it eat through batteries, my understanding is that the batteries need replacement every year but have yet to see one in person

oops sorry, my bad! I think annual battery change was specified originally. I only wear mine occasionally so have not put it to the test.

Stephen