Welcome to the forum!
You need to be careful with the 590 as there is little to identify it from the 595 (apart from decal), but a genuine one is pretty hard to find, only being produced for a year or so. Its shame you dont have a box, but you can always buy a 595 boxed and put it in that, as I think the 590 came supplied in it too, although we have also seen variations on the French issue box.
If you have any more questions, please dont hesitate to ask, we are all willing to help, and looking forward to seeing your collection!