Here we have an early Primus which has suffered various modifications and has clearly led an eventful life, even although in other respects it does not appear to show undue signs of wear from use. The various modifications include non-original filler cap, pressure release screw and burner (that fitted is a Juwel unit), it also appears to have a rather neatly retro-fitted 1896-or-later type of pump tube. Remaining key early features are the early B.A.Hjorth tank base stamp, the lack of a model number, and the pump cap and rod assembly. Those key early features place this stove later than Hjorth's taking over of Primus marketing in 1892 but earlier than the introduction of model numbering in 1895. A stove from this period would originally have been fitted with the pre-1896 removable type pump assembly which is well illustrated on the other stoves shown in this section of the Primus stove gallery. On this stove the original pump has been replaced at sometime and for some reason even though the rest of the stove, legs etc do not appear heavily use worn. So far so good but there is one very puzzlesome feature. The only tank top legend present is the deeply impressed, crisp, one word: 'Patent'. There is absolutely no sign or trace of any other marking at all. There are known examples where "Patent' is clear but the name 'Primus', or later the legend 'Primus No.1', is very weak in comparison. In this case, however, there is no indication that the Primus name has ever been present. So is it possible that there were some stoves made, presumably just after Hjorth had taken over marketing, which only had the 'Patent' mark alone and before the 'Primus' name was added too?