The Trangia timeline is an excellent guide to help date your Trangia stoves, with dates staring from 1925 up to 2010, this is rare and invaluable information for any Trangia collector or enthusiast, the list of dates and production changes will not only help you identify the model and approximate age of your Trangia, it has useful information about "some" Trangia accessories too.
1925 -The company Trangia starts to produce cooking ware for households
Around 1935 - produces the first camping set, no 24.
1951- the first prototype to the Trangia stove was finished, model 25.
End of 50th - the Trangia stove comes in a smaller model, 27
Early 60th - the holder for the burner moves from upper to lower windshield
1964-1976 - Produced the larger burner for the Military Mess kit for the Swedish Army (the kit is not a Trangia item)
Early 70th - hooks and the ring on the windshield is changed to stainless steel
Early 70th - the handle is now made with air holes
1969 - fry pan in nonstick
1979 - winter attachment to the burner
1987 - saucepans in nonstick
1985 - Mini Trangia, originally made for multi sport competitors
1988 - Gas burner is available to the Trangia stove, manufactured by Scorpio & later Epi Gas
1988 - the windshield is manufactured with bayonet coupling
1993 - sauce pans and fry pan in Duossal (stainless steal/aluminum)
1995 - the Gas burner is made by Primus
1998 - sauce pans and fry pan in Titan
2001 - multidisc 27+25 is available
2002 - Multifuel burner from Optimus
2006 - new thinner material in sauce pans and windshield,Ultralight aluminum & hard anodized
2010 - Multifuel burner is made by Primus
2010 - Trangia Triangle is available
2010 - Trangia is from before a registered Trademark but now also the Trangia Stove is a registered 3D shape which protect the stove from unlawful copying
I hope the Trangia timeline has been helpful to you, if you are still unsure about the model or date of your Trangia stove, please feel free to contact me, I maybe able to help by providing additional information, alternatively if you have any interesting information regarding dating/identifing any Trangia products I would be pleased to here from you.