It's from K.S. Enterprises in Japan. They look to be a wholesale exporter only...(
http://www.ksenterprise.co.jp/yanmar.html) and sell only used, unreconditioned tractors and equipment (
and offer parts support to dealers stateside).
I don't believe the pictures are very old as these are in their current inventory. The site is interesting as they brake down catagories into subs' like the YM series is 00- 01-10, 02-20 then the same with the F/FX and FX 3 digits (FX145-FX435 -4 cylinder).
Mark