This is very similar to those hay trolleys that were made by F. Myers but I cannot confirm this one is as there are no discernible markings on it to verify the maker. The aging & patina on this piece is quite amazing and would make a terrific rustic decor piece in any home. As shown, there appears to be a top wheel piece missing.
It stands up flat on a table via 3 of the 4 bottom wheels. You'll notice that the bottom wheels are not totally in line, All the wheels are frozen and do not turn at all.
The top circular piece does however rotate with ease. It stands just under 16" wide from the outside of the wheels, 14" high and roughly 7 deep based on the circular top that rotates. The item "Vintage Antique Adjustable Hay Trolley Unloader Barn Pulley Farm Rustic Decor" is in sale since Sunday, July 14, 2019. This item is in the category "Collectibles\Tools, Hardware & Locks\Tools\Pulleys, Block & Tackle". The seller is "planetstorefront" and is located in Lebanon, Pennsylvania.This item can be shipped to United States.