I recently acquired this stove and have been doing some mild fettling. The stove is clearly marked as a Primus No.210 but to any knowledgeable stove-person it looks more like an Optimus No.00. This is because in 1962 Primus stopped production of all paraffin and petrol stoves and AB Optimus acquired the rights, from Bahco, to produce and market the stoves under the Primus trademark. The operating company was called PRIMUS TRADING AB. This led to a major rationalisation of the product lines of both companies, with some models being discontinued and others being re-badged to achieve manufacturing efficiencies and profit. So this particular Primus No.210 stove is a re-badged Optimus No.00 Here are some photos: I treated the tin to remove rust and preserve as much of the original graphics as possible: https://classiccampstoves.com/threads/primus-210l-from-mid-1960s-ptc.33582/ The tank top is lightly engraved compared to earlier Primus 210 stoves, nevertheless we can see PRI MUS REGD TRADE MARK, MADE IN SWEDEN, and PRIMUS No.210. The base of the tank is engraved MADE IN SWEDEN. The burner is an Original Primus product and is marked both PRIMUS SWEDEN and in Arabic Text. The flame-ring is a "universal" PTC item and is marked SWEDEN SWEDEN. The reserve cap is "parked" on the top of the pump knob when not in use on the tank. The pump shaft is brass. The NRV is marked MADE IN SWEDEN and uses a one-piece "cone" fitting rather than a brass carrier and nitrile rubber pip. This cone was still supple so was re-used. The folding tank feet are the Optimus flat stamped design rather than the stamped and folded design used on earlier Primus No.210 stoves. The tank legs have Optimus-style bends at the top rather than the familiar Primus pattern The Instructions are generic Optimus-type instructions, in 5 languages, with cartoon illustrations. They are marked MADE IN SWEDEN, with no stove brand mentioned. The pack of three shaped jet prickers are contained in an envelope marked No.4605, and on the rear lists those Primus stove models the prickers are intended for. We also have printed: PRIMUS, REGD. TRADE MARK, PRIMUS TRADING AB, and UPPLANDS VASBY SWEDEN, the location of the OPTIMUS factory. The spanner is marked MADE IN SWEDEN. A hand written label on the tin has the pre-decimal price as 62 shillings (decimal GBP £3.10), which is consistent with the UK price for this particular stove etc in the mid-1960s. NOTE: the spirit can and improvised windshield are later replacements. To me this is an interesting stove as it illustrates the changes occuring in the liquid-fuelled stove industry at a key point in its decline. Best Regards, Kerophile.