This 'Eskilstuna' has had a long and hard life and there is not the documentation to be able to be too precise about its date of production. The 1911 and 1912 Erikssons' catalogues in the reference library would seem to be a little later in date than this stove, but the key features are all there: the external-NRV which seems to have become confined to the 'Svecia' branded offerings by the times of those later catalogues, and the distinctive leg shape which had then been inherited by the 'Prince' brand line. The elaborate font used in the main tank legends seems to have been superceded by the time of the 1911/12 catalogues too. The stove appears to have spent most, if not all, of its life in Russia and careful examination of the photographs will reveal several Russian origin substitute parts. The burner and riser are old Soviet units, apparently from the 1960s. I have elected to retain these as neither is compatible with the threads on any other components that I possess, and they are part of the history. The pressure release screw is marked 'Искра' ('The Spark'), 'Москва' (Moscow), and I am not sure what to make of the pump rod end knob. The pump tube cap was an utterly worn out 'Prometheus' marked item, this was another old brand found in Russia although possibly originating from Germany! The height of the burner unit relative to the legs is such that it can only have been intended to have been used with the lift to pan given by a cast iron trivet. The original cast trivet must have been long-since gone, but I have also been lucky enough to obtain a history-appropriate old Soviet era trivet thanks to the great generosity of one of our Russian members. (The legends here translate roughly as "Artel 'Bolshevik' Dnipropetrovsk BKPO") With work now done to the pump, the burner, and the drilling out of the blocked NRV-tank vents and the blocked jet nipple, we now have a functioning stove. The only completely new parts needed were a pump leather cup and a cork NRV pip!!! @Bratok_xxl acknowledged with gratitude.