I'd be suspicious that some swapping had taken place. Regardless, it is used and is what it is. If the lockup is good and it is, in fact, an SB-2 frame you could offer, or ask, for a better price.
The std. Williams WGRS peep sight is a 'field sight', not a target sight, so you would have the option of just what rear is a better sight for you to buy if you must have a peep.. A small bead front works far better for me as a field and casual target sight anyway and most used guns dont include the whole set of Lyman Inserts for the Globe Sight.
And if you really want to know what it is capable of for accuracy the scope is the way to go.
If it is clean and passes the tests that isnt a terrible price if you like a long barrel and the BC wood.