The tank is made by Optimus and the top plate, burner, filler cap and airscrew are AB BAHCO (same as the parts used from 1955). The burner is a genuine Hjorth 4139, while the spirit cup is Optimus. Truly, it's a mix! Interestingly, the last genuine BAHCO Primus No.5 in my collection has a six digit number ending in 064, so 1964 was clearly the year of transition. Yet, this one is stamped AB BAHCO on the tank. The front panel of writing as well as the Arabic "Made in Sweden" stamp (both used on the older BAHCO stoves, and, in the case of the Arabic, later again on the Optimus/Primus ones, though on top of the tank) are missing from this stove. All in all, most interesting.
