A tiny petrol/gasoline/Coleman/panel wipe fuelled stove. Includes a 'quicklight' priming mechanism using the stove's fuel. There's also a high-low flame control lever which works well - the flame height can be controlled down to barely nothing to give excellent simmering capability. This stove has a reputation for melting the control knob (as here). Probably not one of Optimus' better efforts, it was superseded quite quickly by the 324.