Re-tweeding would help some people visualize the amp better, but it might turn other potential buyers away.
I'd let the next owner re-tweed it. Every time you do a repair on a vintage amp, certainly a cosmetic repair, you are cutting down on the number of people who want to buy it. They might want to do the 're-tweed' themselves, or they want their 'special guy' to do it, or they hate the quality of work of the person who re-tweeded it, or they want it to look brand new, or they want it to look relic'd, etc.
I'd take the chassis out of the cabinet and take pics of everything from every angle, so they potential buyers can 'see it all', including the shape of all of the inside of the cabinet panels (sometimes the upper panel will crack near the control cut-out).
I don't think I'd take the speakers loose from the speaker board, unless you've already done it. Sometimes the old paper speaker gaskets have permanently adhered to the speaker board and won't come loose. Those same gaskets can also attach themselves permanently to the speaker cones and the cones will tear when you pull the speaker loose from the board (seen it happen).
I would take detailed pictures of the back of the speaker cones so the buyers can see if they are original. If they are looking for small holes in the cones, put the cabinet (with the speakers in it) in a dark room, shine a flashlight on the back of the speaks and see if any holes or tears show up (as spots of light) from a 'frontal view' of the cabinet.
Again, good luck.
