Another external-NRV Optimus No.1, and with yet another combination of small details to throw into the discussion mix regarding the precise dating and timeline sequencing of these external-NRV models. The fact that this is a '1S' version and it has feet answers one question asked previously(c/f). Now at least we can see that some later budget ('S') versions did have feet on the legs. A relatively late in external-NRV Optimus production also seems to be suggested by the filler cap and pressure release screw combination which is the same as this slightly later early internal NRV example. As a 'user', and after the sorting out of numerous little niggles, this is now a cracking little roarer . The burner itself is a slightly later date Optimus service replacement unit. @OMC @gieorgijewski @abbahco1
@gieorgijewski - great corroboration, so that's 2, both with feet on the legs, and both with the same specification filler caps and pressure release screws. The fact that those latter 2 fitments are the same would seem to give confidence that they are the original fitments and not accidental later replacements. Ian
tank bottom stamping fits circle 23 mm diameter (check diameter in Yours) filler cap: die is the same my stamping is "older" Yours - made with more used die
@gieorgijewski - yes, base stamps both same size. Good point about the relative signs of wear on the dies used for those base markings. Ian
moment... small resume: examples 1 my 2 Optimus No.1S c.1912-14 3 from current topic ----------------------------------------- if S (photo 3) OPTIMUS No 1 S is the same - then every 3 examples has different top tank stamping. Because my and "2" are not the same. this moment i can say nothing about "2" fuel cap design, "1" and "3" are the same on bottom stamping in Yours - used "maltesee cross" seems it is older version and "ghotic S" from "3" -> seems to be older then "rounded" from "2" my example seems to be youngest "3" oldest ------------ We need "find similar short legs" (as in my) - example
Hi Ian @igh371 . I think the filler cap markings and the tank base markings on this stove are similar to yours: Travelling-Optimus No:1 - 1914/18? Best Regards, Kerophile.
(- my emphasis - IGH) Hi Gieorgi, 'seems', but not actually the case. The almost 'black letter' Gothic script does give an antiquated look to us now, but in fact it was adopted by Optimus closer to 1920 (see e.g. these 1920s internal NRV No.1s). The simpler tank top script is actually the earlier and found also on pre-1911 Optimus production (eg this pre-1911 Optimus 100). The pre-1915 Optimus No.1s also share the simpler script alongside this combination of filler cap with an incuse script pressure release screw: So put into a sequential timeline we get: 1. Those with the plain cut legs, all-incuse script ancillaries and simpler tank top script are the earliest (and probably all a few years before 1915). The earliest versions sharing these features also had had the word 'Patent' incorporated into the tank top legends (e.g.). 2. The version you label above as '2' (this), which still has plain cut legs, comes next, but still just pre-1915. 3. Followed by your nice nickel plated example which has legs with feet and the next iteration filler cap, but still the simpler tank top font (link). This would also be the place in this timeline for @kerophile 's No.1 Travelling Optimus. 4. And finally, last of all, the youngest, closest to around end of WW1 must be the stove in this current thread which shares most features with your nickel-plate example, but which now features the more Gothic type tank top script and the more elaborate separator crosses in the tank base stamp. These discussions certainly make you think! If only we had more comprehensive Optimus catalogue information or Optimus had had a dating system like Primus life would be so much easier! Ian @abbahco1 @OMC @gieorgijewski
o.k. - and thanks for above... --------------------- OPTIMUS A.B. OPTIMUS A/B OPTIMUS STOCKHOLM Stockholm 1 OPTIMUS STOCKHOLM 2 OPTIMUS Stockholm 3 A.B. OPTIMUS STOCKHOLM 4 A.B. OPTIMUS Stockholm 5 A/B OPTIMUS STOCKHOLM 6 A/B OPTIMUS Stockholm bottom/base filer cap i must check them - is existed --------------- i need "do my homework" btw it looks as the same story as early PRIMUS bottom stamping especially "Stockholm" version
Not to mention the angle of the air release screw. On Optimus models after about 1915, this is always angled towards the right, rather than being placed at 90 degrees to the tank. On this one, you see the angle clearly as 90 degrees.
"this one" being the oldest of the set drawn into the discussion here, i.e. the pre-1915 cap twinned with the incuse name pressure release. So yet another useful dating indicator
A "model 1914" stamp is seen on the top rim of my optimus no1,has anyone seen this before? Legs have feet and optimus burner has Arabic and Russian writing on it. Polishing this up for display as it is to damaged to restore to use
@Steven Whalley I’ve not seen that type of marking an Optimus before, as far as I recall. Cheers Tony
