There are grey market Shibaura tractors but the 1220 is a U.S spec Ford model, made for them by Shibaura. Most of the "big" names have had their compact tractors made in part or whole by Japanese tractor manufacturers for many years. The old grey market Shibaura's are in general hard to get parts for but I suspect that "most" parts are available for the 1220. They were made from the mid/late '80's until the late '90's so I would suspect there are a lot of them and they aren't that old (in the tractor world).
Examples of "brand" name compacts and who made them are;
Massey Ferguson's were made by Hinomoto and Iseki
Bolens, White, Agco ....Iseki
John Deere...... Yanmar
International Harvester/Case IH and Cub Cadet ...... Mitsubishi
Ford/New Holland........Shibaura
Probably forgetting some but you get the idea.