Primus No.4 1915 'E' with, interestingly, exactly the same 'E' overstamp on a tank that had originally been made with the 1914 'D' date code as also appears on the only other 1915 No.4 on the gallery. The other interesting features on this example are an original burner with fixed flame spreader skirt all in good order, and a very nice cast trivet. Unfortunately not up to the tea test with this one due to continual rapid loss of pressure through a faulty but particularly recalcitrant NRV. But there is currently no rush to go further with tackling this. I now prefer a slowly slowly approach to this sort of problem rather than risking doing damage that would necessitate yet another pump tube extraction!