Yet another pre-1911 Primus '0' with all of the usual old solder repairs in all the usual places! The main point of interest with this one is the rare survival of its original, simple pattern, burner. (OK so it's got a new flame ring, I'm aware of that!). Actual dating is always difficult pre-1911, but 2 other features I think probably place it c.1908/9. These two features are the short-lived 'PRIMUS PATENT' pump tube cap, but in combination with the earlier type of pump assembly which is normally found twinned with the earlier 'Lindqvist's Patent' pump cap. Detailed comparison can profitably be made with the detail similarities and differences, right down to the stiff-nut on the rod end, to be found on this other, slightly earlier, example. Similarly the font on the single-sided pressure release key is slightly different to those on those model '0's that I have with the Lindqvist's caps. So overall this seems to place this stove at the very end of the period of use of the older form of pump rod assembly, which itself seems to disappear from catalogues c.1908.