I'd probably drop $30 to $40 for the lot, may be a bit more if I had a lot of money in my pocket. It's that I've gotten more for less, and still had to put a lot in the garbage. You could piece them out on e-bay or craigslist and get more but, unless you already do that as a hobby, I don't feel it is worth the time.
The U.S. Divers 2nd stage, Pressure gauge (if it works), folding knife, and weights (if they are 1 or 2 pounds) I might work into one of my rigs, but, subject to closer inspection, the rest looks pretty used and useless.
Sorry, but you run into more gravel than gold when looking through old dive gear.
Bob
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I swear its not hoarding dear, I'm just keeping an adequate stock of equipment and parts. It's life support, you know.