Construction
Made of solid brass, the Svea 123 weighs about 500 grams (19 ounces), measures 100 mm x 130 mm (3.9” x 5.1”) and will burn for over an hour on full tank (about 4 ounces) of fuel. Later models (designated the “Svea 123R” and also sold as the Optimus “Climber”) were made with a built-in cleaning needle to keep the burner jet from clogging by pushing soot or other impurities outward; early Sievert models without the self-cleaning needle came with a small wire pricker that is used to clean the burner jet manually by pushing the soot inwards. These older models are distinguishable by their downwardly-angled spindle and control valve, to which the adjusting key is attached. The spindle on a Svea 123R with the self-cleaning needle is at a right angle to the stem. Other differences between older and newer models include the vaporizer on older models, which is smooth, while newer models of both the Svea 123 and the 123R are finned and have a stronger joint configuration at the base. The pressure-relief valve in the filler cap has also been redesigned several times to improve both reliability as well as re-seating of the valve after it has opened. A brass windscreen attaches directly to the stove, and has built-in pot supports that fold inward for storage. The aluminum lid comes with a detachable handle and can also be used as a small cook-pot.
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