Thank you for the link to the Trangia website, Freiston. There's a lot of helpful information there. I scanned their website earlier, and found the model I have didn't resemble examples shown from the 1950's or 1980's. Then there was quite a gap between these years on Trangia's contents page. Now I've looked again at their website, the closest photo to the set I have seems to be the one on this page https://www.trangia-central.com/trangia ... llery.html
, about half way down, titled "A very nice 1970's Trangia storm cooker with kettle". The air holes in the handle date it to early 1970's. I believe the model I have is a 25-1 model, with a 22cm frying pan. It's quite bulky for solo moving on tours, but great for meals and brews when staying at one campsite.