Order a rebuild kit, diaphram, and hose kit (hoses, wagon wheels, duckbill, new mouth piece, and clamps - Yellow hoses with a black mouth piece look great in photos) and you will bring that DA up to snuff. Costs should be $140 plus shipping. When you order, make sure you check out his "Free Stuff" section.
NICE! The DA appears not to have a serial number..if so it's a 58-59 model and appears to be in great condition. I clean the cans in denatured alcohol, stinks less than MEC and is less toxic. Soak the gooey part overnight and the stuff washes off the next day. In either case you should very carefully remove the label or at least be very careful not to get MEC or alcohol on the label, both will strip the nice paint you have on the label off, neither will hurt the cans.
I would throw in a band clamp and personally I much prefer the silicone Voit hourglass mouthpieces to the straight ones...not "original" but are a lot more comfortable IMO and well worth the extra few bucks it cost, esp if this will be a often dove reg. Besides, it also looks good with yellow hoses.......Now you need to start a penny jar to save up for Sand Dog VII.
PRAM on Bonaire....to the horror of the DM's.... NO BC!!