This Tressa Electronic is an extremely rare model indeed, you can easily verify this just by trying to find it on internet. The watch is of top quality made, it is entirely made of stainless steel, the strap is an original vintage from the early 70s when the watch was made. Movement is Electronic 13 jewels ESA 9154 which started to be produced in 1970 and was made until mid 70s. This is an early version of electro mechanical watches NOT QUARTZ, and works identically to a mechanical watch, with the difference that instead of a winding spring, it has an electromagnet that moves the balance of the watch, because there is a permanent magnet on the balance, and the electromagnet underneath changes the magnetic field, and that’s how the balance moves. A fantastic example that is rarely seen without any flaws or traces of use.
