Eterna Demonstrator?

[Dave Coatsworth]

I picked up what I assume is some sort of store demonstrator for Eterna. But, what is it supposed to demonstrate?

 

[dAz57]

Compensated tuning fork?

 

[Adam Harris]

My guess quartz, oscillation or battery strength
Pyre guesses

 

[Chris Radek]

The Eterna Sonic used the ESA9162 movement, which has a tuning fork shaped a lot like that demonstrator, with weights above and below the foot. This fork shape is superior to the Accutron's because it eliminates the inherent positional dependence (difference between tines-up and tines-down rates, which on an Accutron is about ±4.5s/d)

I imagine this is to demonstrate that difference to a customer, but I wonder how exactly...

 

[Jeff Hess]

The Eterna Sonic used the ESA9162 movement, which has a tuning fork shaped a lot like that demonstrator, with weights above and below the foot. This fork shape is superior to the Accutron's because it eliminates the inherent positional dependence (difference between tines-up and tines-down rates, which on an Accutron is about ±4.5s/d)

I imagine this is to demonstrate that difference to a customer, but I wonder how exactly...

Awesome! thanks! I have always loved the old Eterna's marketing. They also made some cool pocket demonstrators of see-through working movements!

 

[Dave Coatsworth]

Thanks, Chris!

 

[RL]

I have seen a few of the Eterna tuning fork watches. They were really nice looking and well made.
Havn't seen one lately.