Question for all you gravely guys. I came into possession this week of 2 Gravely Model l tractors along with a reel mower, rotary mower and 2 cultivator sets. There is a little difference and I am trying to figure out which is the older one. One is serial number 83088 but the other tag says model l but the number is worn and unreadable. The one with no number has a push-pull rod that will stop and start the attachments. The other has a lever that you switch to off or on. Also the one with no number also has a piece of sheet metal that fits around the plug and covers most of the head where the 83088 has no cover {could just be missing but not to familiar with these machines} The motors look to be the the same except the 83088 has a governor attached to it. Also would they be the 5 hp or the 6.6 hp? I found that the 83088 was made during 1953 I believe. Confusing but any ideas would help.