optimus123 loginSvea No: 123 & 123R. The 123R was the later version produced by Optimus after they took over the Svea brand in 1970. There are many claims that the 123 model has beenSvea 123 stove. The Svea 123 is a small liquid-fuel (naphtha, commonly referred to as white gas or Coleman fuel) pressurized-burner camping stove that traces its orins to desns first