Sekonda Molniya 3602 pocket watch movement

This is the movement/mechanism of my Sekonda-branded Molniya pocket watch.
 

This movement - the ‘Molniya 3602’ - is one of the features that persuaded me to buy this 1980s(?)watch, as opposed to a current-production Sekonda.
 

This 18-jewel movement is an improved version of a 15-jewel Swiss movement that the Soviet Union made under licence.
That movement - the Cortébert 616 - was used by brands including Rolex, so it isn’t just ‘cheap junk’, but is instead a decent movement that was intended for long-term serviceability.
 

It includes an adjustable regulator, which will enable me to (try to) adjust its speed.
 

The movements in current-production mechanical Sekonda watches appear to not have an adjustable regulator, and they also appear to be inaccessible anyway.
Worse still, recent consumer reviews of them say that build-quality has declined remarkably in the last few years.