Well, the empty cab without speakers, personally I would not pay more than £350 GBP for it (approx 460 USD). It is too rough to be worth much in my opinion, like I said the grill is about the best thing going for it. Without that, there is very little 'collector value' there at all. It's a players cab, or 'workhorse'. Does the job and sounds good, but nobody wants it in their museum. It could be restored but it is a lot of work and additional expense, and would still not be worth the same as one in 100% original condition afterwards.
Reconed speakers, their value depends on what type of cones they have, and whether they still work properly and sound good. They can still have issues such as coil rub, so always check. If they have fitted NOS pulsonics then they should retain some value, but pretty much anything else is going to be very detrimental. Some recones sound good, but some do not. If they are the waldom cones, forget it - they sound horrible.
Bear in mind how much you can buy great sounding used chinese greenbacks for on ebay (about £40 GBP each?), and would you honestly rather have reconed pre-rolas over some modern speakers? I wouldn't.
So, lower end for the whole thing, maybe £500 GBP (approx 525 USD). A more optimistic price might be around £700 to £800 GBP (approx 1050 USD) if you can find someone crazy enough to pay it. Dealers are asking silly prices for any old crap thesedays. I've even seen some sellers asking top prices for reconed pre-rolas as if they were the mint original pulsonic cones

They either dont understand where the value is, or they are real chancers hoping for a naive buyer to come along. Probably the latter.