Early bun feet Optimus 00, in black/blueish tin, and its distinctive looped handle on the front panel. Lovely patinated brass tank, marked ''Optimus No. 00'' ''Made in Sweden Patent''. The dimpled spirit cup, the prolonged pump knob, and the pot supports (with the period-correct bulgy sleeve stop) are indicators of a production-date that is likely the 1920's. Found almost complete - the set's only missing a wrench, three prickers and a windshield, but does include a spirit can (I have a similar one that was included in an Optimus 200 set, pictured HERE), so should be period-correct for the set. And best of all - approved by the 'missus'!