RJB
Nice looking unit, I am sure you will enjoy having this known to be very reliable unit.... it was very popular tractor in Japan and many have come over to the US..... I am sure one of the experts can tell you exactly and may provide exact dates on some of the following.. Certainly a Len Schaeffer or if you contact the Hoye Bros, they could probably give you exact dates.. Back in the 70's and 80's, Iseki was primarily if not exclusively making there small tractors for US distribution for and under the "White" and "Bolens" name tag... If you go to
www.ironsearch.com, restrict your search to 1) tractor compact and pick MB for Manitoba, Canada, you can see a 1988 White Model 21...(they incorrectly listed it as Agco/White, however I am not sure "when" AGCO acquired the White Tractor line and it was certainly not marketed as such in 1988). This tractor essentially looks just like yours exept in the trademark White "Silver" color except it is a 4WD unit, and also maybe a slightly different engine... Japan generally used the model number to designate PTO HP... So, your 1900 has 19HP at the PTO... not sure if the Whitel Model designated 21 at the PTO or was the engine HP.. could be either I guess.. The same TL style you have came in 1900, 2100, 2500 etc. series designating PTO HP... Iseki also made the Bolens small tractors until they quite marketing all but smaller lawn and garden equipment.. you can see many Iseki's with the Bolen's name, most were smaller HP and many had 0 Cat. Hitch...
Again, not certain on the dates, but back in the 70's and 80's, most of the Massey Ferguson smaller compacts were made by Hinomoto in Japan... larger ones by Mahindra in India... Again, AGCO acquired the Massey Ferguson name, some time ago.... so, you can find Hinomoto's that look just like Massey's.. Sometime in the late 80's Hinomoto was acquired by I think Iseki or they went out of business. Around 1991 or so AGCO decided to have most of compact tractors both the White, Massey (except the Mahindra style and size) and now AGCO ST series and Caterpillar MT200 series line made by Iseki....
Sorry to make this so long, but with the consolidation of both US and Japanese Mfg'rs. it has changed up a couple of times.. Again, I am sure there is an expert out there that can put some exact dates on the above....
Happy tractoring......