Engine with visible gears and gearbox

The engine model is metallic and rectangular with a flat base. Numerous gears and cogs are visible within, arranged circularly. A two-gear gearbox, featuring one larger and one smaller gear interlocked by teeth, is situated on the right side. Bolts and nuts, presumably for attachment purposes, are present on the top and sides of the engine block. The model exhibits no apparent signs of damage or wear.