£70
Two Sterling Vertical Cylinder Hot Air Engines, one with 25mm stroke, 6cm brass flywheel, burner for external gas supply, brass/copper construction, overall dimension 10 x 15cn base, 28cm high, mounted to a wood base, the other 25mm stroke, twin 5.5cm flywheels, electric burner, brass/bright metal construction, mounted to a 12 x 14cm wood base, 22cm high.
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