Same goes for old wooden windows etc. that can last a hundred years or more if properly taken care of.
"Heavy is good, heavy is reliable. If it doesn't work you can always hit them with it." — Boris 'The Blade' Yurinov
The key may be the "properly taken care of" part (or they didn't buy crap at the time part).
I live in a greater than 200 year old house and all the older windows dating to whenever are complete crap compared to newer Andersens I've had installed.
As for other pieces of furniture, e.g., cabinets and stuff, we bought them used from a place that combed estate sales in Denmark for furniture and sold it in the US. One attraction is that the old furniture is smaller, so it works in a smaller house.
https://i.pinimg.com/originals/a2/c9/50/a2c9506ff9f3d65541d5...
https://2.bp.blogspot.com/-ZrMM8Wa1DuU/UkRPE9INzeI/AAAAAAAAC...
I wrote my original post in haste - the cost was for doing the couch and a matching chair (same side-profile, just narrower.)
I wonder, is it even possible it's solidly made despite being very light?