Is it a grey market?

[Frank Cahill]

I recently saw a Yamaha U1 that I was considering for my own. On the
plate was stamped "U1E". 

What is the "E"? I'd never seen this before. Maybe it's a grey market
paino. 

The piano was at a Yamaha dealer, and he says that the "E" means that
there was a slight engineering change and that it was stamped on the
plate to keep track of that manufacturing run.

Any thoughts on this?
-- 

Frank Cahill
Associate Member, Piano Technicians Guild
Northern Va