It has 801 style fenders on it but it appears that the grille screen/cover is completely gone. Appears that the intake tube comes straight down from the air cleaner which indicates 801. Photos are too far away to tell much about it.
 
801 is the series of the tractor not the model. The 801 series had the 821, 831, 841, 851 861, 871 and 881 and the last 2 are the only ones with the SOS. The 821, 831, and 841 all had 4 speeds and the 851 and 861 had 5 speeds but the 861 had a 2 stage clutch giving it live PTO. So you are or have been misinformed
 
The serial # will tell you the year of the tranny but not always the tractor because more than a few have different trannys in them!!
 
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