The No.48 is a little less common than its roarer sibling, the No.45. The fuel jet has recently had to be replaced due to over-fuelling. Brass ‘OPTIMUS - SWEDEN’ outer cap - assumed to have been produced before 1962. The pump knob double-duties as the reserve cap… Sunken filler - introduced by Optimus in 1957/58 Air release screw sited on top of the filler cap - shown in the 1959/60 catalogue https://classiccampstoves.com/threads/1959-60-optimus-brochure.9087/ (courtesy of @Spiritburner) Tank stampings… Pharael.
