That's what I get too, a 1952 77 Standard. 

Looks like you have the correct engine as well. It was a joint effort between Oliver and Waukesha, with design features unique to the Oliver version. Oliver did much of their own design work, and poured the castings. The pieces were then sent to Waukesha, where they assembled the engines, and then sent them back to Oliver for installation in the tractors. The 185220 number is the Waukesha part number for the block, and M100 is the Oliver Part number. Somewhere near those numbers should be one more set about 4-5 digits long. That will be the date that the casting was poured.

Your 77 would have come with the Meadow Green paint, Martin Senour  99L-3751, same as that 170 manure spreader would have been painted. You can get more paint codes by checking out this topic on the forums:
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Also, the C77E is the transmission code for your tractor. This was the regular transmission for the Standard tractor. It had 13 pinion teeth and 48 teeth on the differential.