need some more pictures of the side and back side of it. Looks like one for a 460/560 from this picture.
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Pickers: IH 2MH on Farmall 400, IH 234 on 766, IH 234 on 706, 2- 234 sheller units, 234 husker unint, 234 grinder unit, IH 34HM-20, New Idea 305 w/ husker, IH 14P pull type Shellers: Moline model E
Pretty sure it is for a 460 or 560. From the way it is shaped it would be a later one. Most likely 234 era, I have one from the 2MH era and it is shaped different. However don't know when they changed shapes.
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Pickers: IH 2MH on Farmall 400, IH 234 on 766, IH 234 on 706, 2- 234 sheller units, 234 husker unint, 234 grinder unit, IH 34HM-20, New Idea 305 w/ husker, IH 14P pull type Shellers: Moline model E