Eterna Sonic electronic
Case ref: 188 T
Case no: 5820280, size ex signed crown 37 x 41 mm.
Calibre: 9162 ESA. The Eterna Sonic of 1970 was the first electronic Eterna watch. The oscillation source was a Tuning Fork so the watch hummed instead of ticking.
Beautifull brushed and polished sides, mint hands and mint dark blue dial but very hard to picture.
Original crown and signed glass, renewed date weel, completely serviced as usual, in mint condition.
Non-brand strap and buckle.