This is a model 711 with a trip manure bucket with looks to be a plate/skirt on the bottom of the bucket. It appears to be what they call a long box. The photo you show will not fit anything unless you already have the brackets for it on your tractor. It will fit your tractor if it has the proper brackets. You need to ask owner what it came off off and if he has all the brackets to attach it to that model tractor. Some of the brackets from the 8n and NAA are worth more value and easier to sell or trade for the brackets you will need.
It's too much money if sold without brackets. Many times the ;oader are taken off and the tractor get sold separately with the brackets still on it. Also ask owner to send you a photo of the brackets so you are getting all the brackets.