You want a good cheap watch?
Then allow me to introduce to you the 1967 pattern Vostok Amphibia.
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Nominally Russian, so out of fashion due to Blat Puking and prices have tumbled so these highly robust 200 metre timekeepers can be had for about £100. In actual fact the factory is in Lithuania.
A very interesting story. In the 60s the Soviets wanted to develop a watch for navy divers, Spetznaz operators, etc. but didn't want to infringe upon Rolex's patents. Of course today they'd just say "f*&% Rolex" and made a clone.
They gave to job to two engineers and they came up with some clever solutions.
During WWII the US had gifted a watch factory to the USSR, so they nabbed an updated version of the movement the factory produced, so it wears a movement that can trace its origins back to the States.
Instead of a screw on case back it rests in place and a lock ring sits atop it. This is actually superior to Rolex and the like as no shear forces are put through the seal.
Quartz glass is expensive and, again, the best patent solutions all belonged to Rollocks. The engineers Instead used Plexiglass and a clever design that permits the glass to deform under increasing pressure and actually increase the effectiveness of the seal. It also means minor scuffs can easily be polished out at home.
The final design was released in 1967, hence the name, and little has changed since. Actual 1967 special editions with all the face and markings are expensive, but versions like mine - physically the same watch but with different faces and straps - are about half the price. Original early examples go for a grand or more. A very interesting period piece with some good talking points for those of an engineering bent. For those of my era (b.1968) it resonates as a period piece of similar vintage to myself, at least the origins.