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The Mistral should be no problem at all to restore. You'll need to clean it up, but it only has six moving parts. There are parts available at both Vintage Double Hose and Vintage Scuba Supply.
The DA Aquamaster in the last photo shows some unusual color changes, and may have been associated with a fire. Take a good look at the rubber parts in the interior. If it was subjected to heat, it may need new diaphragms (high and low pressure), and other parts may have been damaged.
SeaRat
He has not even got one get going and is already addicted. We warned you!