I need help.  I don't know much about tractors and nothing about Olivers.  I got a good buy on an 1800 at an auction last Feb.  Now I'm trying to work on it and don't know the year or if it is an A, B, or C.  The serial number plate has the numbers 28 - 2104 and below it is the numbers 124 989 - 844.  I would also like to find an owners manual.  Any help would be greatly appreciated.  Thanks alot.