I'm not surprised the older ones are heavier, they are extremely solid and hard wearing. Mine are still pristine (no dents!) after 25 years of abuse. I have thinner ones (non Trangia) bought more recently that are not wearing as well, but they are non-stick and if my pal overheats them on the stove, they will burn. I've also learned that they aren't very good seats, they get dented.
Anyway, I had a trawl. Coleman do a Mini Cook kit, 2 pans, 2 pots/cups/lids, £16 delivered, weight 515g, anodised ally. Or an Exponent cook set, non stick, slightly bigger, 2 pans, lid, handle, £20, free postage, 425g. That's light.
All of these will do a job for you, my Trangia has been fantastic for years, but it's slow and I dislike carrying a rigid windshield around. I use cheap pans for most camping, if you don't abuse them they work well. Finally, I have Coleman pans for ultralight camping, they are very light but small and not too easy to live with. You pays your money and you takes your choice.
If it is just a cookset because you intend to cook on a cannister stove, the cheapest decent one I know is a set of Trangia pots of the 25 or 27 series. They are also sold separately from the stove part of the sets, and they are excellent and cheaper than most sets where you get far more than you want to take. A Trangia 27 pot, a frying pan (also serves as a lid) and a grip is all you need, for a total of 200 gram, and far less money.
Willem
One final bit of advice, don't bother with the mini Trangia, it's useless compared to the real thing.
willem did you use yours before returning it, I never expected anywhere near the same quality myself, mine weighs 615g on the kitchen scale and for just a tenner and a 2year guarantee its efficient and good value , I only ever used a mini gas stove ,1ltr pot an 1/2 ltr enamel mug before , now i defiantly will find it hard to justify spending 4-5 times more for a similar 25-1 ul trangia cook-set , weight 870g, what i did like about trangia though they do such a varied range and are very adaptable with options for gas or multi-fuel burners.This is a copy of an Optimus made Trangia lookalike. In some respects it is a clever design, but there are two drawbacks (I know, because I bought one and returned it). The first is that manufacturing quality is pretty low. The second is that in reality it is much heavier than 600 grams (I had bought it for the weight).
Willem