I do not think Yamaha or Kawai pianos were made to "live "
I suppose like many pianos at thier level they can be restored but that costs
Thier soundboards I think last well, but eventually there may be other problems.The same goes for thier grands. After 50 years(more actually ) my old Kawai 500 grand (all wood action) grand is still being used as a practice piano in a dealership for students.
I have been told that at the time that Kawai was made Kawai was in direct competition with Yamaha and the piano was an excellant model.This was told to me by two technicians who are very well known in Vancouver. The one technician was recommended by the BCRMT and other is the past concert technician in Vancouver who prepped the Hamburg Steinway that arrived in Vancouver ,a year or two ago.(and has since serviced my piano)
This grand needed string replacements , and after towards the end the key resistance became heavy and needed frequent regulation. It had traveled across the equator then functioned here as
a teaching piano for another 18years at least.
We thought about restoration, but felt it may not be worth as there could be more problems as it
Any piano shows its age after 50 years.
So it all depends on how that piano will suit you then. Is it worth restoring or not ?
Perhaps the more special Japanese uprights like the Yamaha YUS5 or the Kawai K800 may be worth restoring and of course the Kawai Shigeru and the Yamaha equivalent.
Very, very ,few items such as mechanical pianos, clocks will be totally untouched through time.
My first piano was a tall (perhaps 48" or taller) pre-war Seiler, what I remember about that piano
was a beautiful tone, a boomimg bass, an excellent sustain.It is similar to my Sauter of today.
The only problem with the piano was a very soft key resistance.As a music student I needed
something with bit more key resistance if I was really going to develope., I also later would definitely
have also needed a grand.
The Kawai was chosen instead of a Yamaha because it was (as an individual piano) thought to be a
better instrument.It's dark mellow tone intrigued my teacher as it did me(and others) for many years.
If we could have afforded a German or American grand I know my father would have bought that.
European pianos were available.
All I can say is that while I appreciate that you have a very nice vintage piano Sweelinck, there are also many very nice sounding modern pianos out there.
People do the best they can to find what suits them, be that a modern U3 or a beautiful sounding American made Baldwin grand from the late 70's.