poor quality yamahas?

[Tvak@aol.com]

I've been tuning two Yamahas for a couple of years now, and I started to 
notice a couple of things which surprise me.  The grand, about a 7 footer, 
has string coils which are completely inconsistent.  Some tuning pins have 4 
coils around them, others have one or two, many are on angles.  It doesn't 
appear to have been restrung, and the strings with poor or few coils look no 
newer than their neighbors with three or four coils.

The console has bichords which have great variation in their wrapped lengths. 
 The left bichord may have an inch of naked steel by the agraffe and the 
right 1/4".  This makes for a poor unison.  Again, it doesn't appear to have 
been restrung, nor do the mismatches look like replacement strings because 
they both are the same in shininess, dullness.

These pianos both date back to the 70s.  Did Yamaha improve their quality 
control at some point?  Were earlier Yamahas plagued with shoddy workmanship 
as apparently exhibited by these two examples?

Or is there another explanation?

Tom S