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Basicically if it has a wooden stick (or some few are metal) that directly drives the sickle by stroking back & forth, it is an older model like a 501 or 14-92 (which are for all practical purposes the same). If it has a little gearbox device down by the sickle and a longer belt to that box and the box makes the sickle go by wobbling internally, then it is a newer wobble-box drive type. I think they are something like a model 450 or so???? I'll guess it is the older style from the rest of the equipment..... I have both a 501 & a 14-92 (I think I got those # right, close anyhow) and use it to cut all my road ditches & water ditch banks, works fine. However, the more they angle, the harder they work or wear. The wobble type are better as they can angle all which ways. You would probably prefer a newer wobble style, however you probably will get along fine with the pitman stick. Probably, but I don't know. The model # on mine are on the right side, a plate rivioted onto the breakaway arm. Also, they had different setups for making the mower bar raise & lower, some don't work as well with non-Ford 3pt tractors as they clamped right onto the side of a tractor arm. As I have a 960 Ford I've never worried or thought much about it, but that's what I understand. --->Paul
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