It is thought only 11 of these model of tractor were made - the White 4 - 325 4 wh drive. I do not have any association with this tractor. It was on the interweb. Five of these units are thought to still exist today. This would be a 1972 or so model year, the end of White Farm Equipment Co. The assembly line was shut down @ 11 units. The tractor in this picture was waiting on some transmission or over-under repair. What would keep keep this tractor from being worth as much as a MM-UDLX. I have heard of auction prices of 160,000 for UDLX's. There are supposedly 40-50 MM-UDLX operating units still existing today and only 5 White 4 - 325's existing today. Does rarity relate to tractor value ?