A small contribution to the collection of this primus model no 501, this one manufactured 1926 (stamped P).
A good find complete with the original regulated burner, and intact control knob of Bakelite-type material. The market for regulated roarer burners must have been very small indeed.
@Oskarsweden The date code letter would be within the circle of the tank base script, not outside. The 'P' is a manufacturing code, the exact meaning is unknown.
it is not "P" as the Year SIGN ------------------------------------------------ in the time of production - was visible changes sets of changes give us elements of datation
@Oskarsweden. What a stunning example of a 501, the finish really shows off the superb lettering and the knurling on the filler cap
@Oskarsweden if it is possible please add detailed photo of logo from PRI - LOGO - MUS fro that example...