what is a synchronous movement?

Synchronous movements are early electric clock mechanisms. They rely on the alternating current of the mains power supply to keep time. The motor spins in sync with the grid frequency. These were popular in the 1930s as homes were wired for electricity. You just plugged them in and they kept ticking without needing a weekly wind.

I inherited this heavy marble one from my grandmother and the hands are swinging loose, is it possible to get the inner workings fixed?

Most mechanical movements from that era can be serviced by a competent clockmaker. Loose hands often just mean the friction washer behind the dial has worn down. Parts for common French and British mechanisms are standard. A professional will usually strip the movement and clean the brass plates.

how to clean bakelite clock cases?

Bakelite responds well to a gentle polish, provided the surface has not degraded. You should start by removing surface dust with a soft dry cloth. Never use harsh chemical sprays. Specialist pastes are made for vintage plastics. Applying a small amount and buffing lightly will often restore the original shine. If the case looks cloudy, it might require machine buffing.

There is a small metal plate on the back of the door with some numbers stamped into it, what does that usually mean?

Numbers stamped on the back door or the movement plates are usually production marks. Factories used them to match the right case to the right movement on the assembly line. Sometimes they indicate a registered design number. This was a way for makers to protect the shape of their case from being copied by rivals. You can look up British design numbers in the national archives.

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Art Deco Clocks Dated 1920 - 1940

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Art Deco clocks are geometric timepieces made during the twenties and thirties, designed with streamlined shapes and striking materials to sit on mantels or hang on walls in modern interiors.