Hi,
From the units I have held in my hand, there is no comparison--the older units are far better. And this goes for USA, Brazil, and Singapore units. Not sure about Indonesia--never seen one of those.
I have a USA and a Brazil, and I find both of them really solid. By comparison, a brand-new Chinese one that my brother bought, had very shaky loose keys, right out of the box. (All voyagers have this to some extent---but the degree of rattling in this CN 12c was unbelieveable--he was afraid it would break if he shook too hard!).
The other differences are electronic--there was a significant change in the physical electronic architecure some years ago. Luiz Vieira knows the detail--if you searh 2 or three archives back in the forum under Luiz, or 12c, you might find it.
I do not remember whether the electronic architecture changes were before the China production.
Also, older units had nice spiral bound manuals, whereas the newer ones are paperback.
And, my Brazil and USA manuals (both spiral) have examples with high interest rates (it was the 80's after all!). I think the 12cp has the rates lowered in the examples--not sure about the 12c manual.
One of my projects is to compile a revision history of the 12c manual--a dauntintg task! For instance, my Brazil and USA manuals have different edition numbers, but I have not found a difference---but it must be there somewhere!
In other voyagers---my 11c for instance--there were errors in the first manual I recieved--and I received corrigenda cards in the mail (yes, I had registered my machine). I still have those--even though I lost the original maunal and bought a new one some years later......
This is the long of the short answer.
BTW are you looking for a used 12c :-)
Best regards,
Bill
plattdesign.net