Best I can see from the picture, you’ve got one of those with a heat activated solid state generator that powers the electric fan. It’s along the same idea as a piezo ignition, where heat (instead of pressure) generates electricity.
The stirling type is completely non electric, (and I just happen to have one on its way from China) has a bit of mechanical kit that looks a little like the guts of an internal combustion engine. It’s got pistons snd cylinders etc, and works off temperature differential. There will be a crankshaft and whirling clattery bits.
https://www.enginediy.com/products/thermal-power-stove-fan-vintage-stirling-engine-physics-science-experiment-energy-education-tool
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