Looks like a 1959 Massey Ferguson 65. A good tractor. I'm not familiar with diesel engines but according to TractorData the 65 came with either a Continental gas engine or the Perkins 4cyl. diesel engine. If it is the Perkins then it is also a well liked engine.
Whether it's worth buying depends on the price, options and what it needs as well as your level of expertise.
Edit: looks like it might have multi-power, that can be expensive and complicated to work on. Looks like a project!
This post was edited by Inno at 13:44:45 11/25/12.
Same-Day Shipping! Most of our stocked parts ship the same day you order (M-F). Expedited shipping available, just call! Most prices for parts and manuals are below our competitors. Compare our super low shipping rates! We have the parts you need to repair your tractor. We are a Company you can trust and have generous return policies! Shop Online Today or call our friendly sales staff toll free (800) 853-2651. [ More Info ]
TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.