Somewhere in the late 1940s. Probably around 1946 to 1948. Where is the logo positioned on the collar and what does the top of the tank look like inside the collar?
Here’s a photo of the collar I didn’t get a picture to the top of the tank as I already fettled her up brought it back to life
Well done on your fettle @MarcoM she’s looking good and running well. These are great lanterns, one of my favourites. Cheers Pete