Doing Research it looks like it is a Model MY54 (But do your own research yourself). Does show wear from use, Rust, oiled etc. Very Cool Old Piece here!!!!
The item "Antique Cast Iron The F. MY54 Hay Unloader Trolley Pulley" is in sale since Saturday, July 18, 2020. This item is in the category "Collectibles\Tools, Hardware & Locks\Tools\Pulleys, Block & Tackle".The seller is "dreed21" and is located in Victor, Montana. This item can be shipped to United States.