I have received the Swedish Army Trangia.
Is the big billy supposed to be stamped anywhere. It is a ally example. The billy, burner and the small pot look to be of different dates. The only definite dates are NC72 on the small pot and NC62 on the burner (marked "SVEA").
I recently bought a stainless version of the Trangia And it definately benefits from a little pre-heating, but once it's going, it just keeps on going. Don't know if anyone mentioned this, but if you use a lid as a simmer ring you have to remove the rubber seal from inside. Also why you can't put the lid back on before the stove cools otherwise you melt the rubber ring and stick the lid down or ruin the seal so you can't store a bit of meths in the stove anymore.