Any mechanism that makes a watch tick is called a movement; this includes quartz, manual (hand wind), and automatic (which uses a rotor to wind the watch with motion). The guts of a digital watch are called modules. If you can wind the watch by shaking it it is automatic otherwise it is manual. Seagull movements are OK for what they are but I would not expect them to last for more than a few years if that.
On what basis do you say that a sea-gull movement shouldn't last more than a few years?