The written information on the back of the photograph states that the spearguns were owned by a diver named Lew Maxwell who owned a dive shop near Miami, Florida. From top to bottom, the spearguns are identified as:
Early rubber-propelled gun with line reel.
Barracuda double-strand rubber gun, made in U.S.
Arbalete Hurricane from France with mechanical cocking device.
Japanese gun-stock rifle.
Reef Raider, rubber-propelled gun made in Miami.
Mordem, an Italian cartridge rifle.
Nemrod, a Spanish compressed-air gun.