Can anyone explain an Oliver 1865 with a serial number of 43600867?  The tractor with this serial number plate was at the Summer Show in Iowa.  According to the &quot;Oliver Tractor Data Book&quot; by Brian Rukes the last serial number made for any Oliver 1865 or M-M Model G-950 is 43600834.  This tractor's serial number is 33 numbers past what was produced.