the 56 has the fold down jack like on the 55's the rake in the pictures is a 256 and the only difference between a 56 and 256 is the jack on the 256 that crank's down instead of fold down. All other parts will interchange on the 56 and 256 rakes
the differnce between the 55's and 56 is the 55 has a straight shaft between the wheels and on the 56 the right hand wheel is placed further ahead and has a shaft between the two wheels that contains u joint on each end.
it could range between 350-2500 just depends on the teeth the bearing in the end of the bars and the bearings in the stars on each end also the over all shape of the rake also would need to check the bushing's in the hubs
Thanks for the information, never seen a 55 or 56, but have rakes a good many acres with several different 256 rakes.
Funny to at auctions you can have a Deere or IH rake in good shape, and a NH missing teeth or having other issues and the NH always seem to bring more money.