sgt brown, I agree with your statemnet about the blue life preserver
"In any event, I would not have any qualms about dressing a mannequin of a late-war sailor in denims, talker helmet and the blue mae west. Conversely, I would have no qualms about dressing a mannequin in late-war flight gear and the blue vest."
As for you shark repellent it is a post war version,the givaway is the red tie tape this is represented well in early 1950's publications.The derrent was used till about circa 1960 then finally dropped after considered useless.
WWII packets are blue with yellow lettering official nomenclature for the AAF "packet,shark derrent ,for use with life vest" stock number 8300-623748 and available for both services by febuary 1945 in limited quantities (2500 for both sevices)"life jacket shark chaser" nomneclature for USN stock number R37-S-75.the issue will be to one person on flights over water with temperatures greater than 65 degrees or between latitudes 45 degree N. and 45 degree S.the AAF version does not have tie tapes whereas the USN version does either yellow cotton or dyed blue.Large quantities were not available till around august 1945 along with USN technical note 87-45 on proper use of packet.
Testing for the shark chaser was conducting from april 9 1943 to july 1 1944 from the naval research laboratory the packet accepted was made in the form of an envelope from vinyl-copolymer-coated fabric with an internal cake made from nigrosine black dye and copper acetate and can be reused.
attached is a vintage picture of the shark chaser. note: domed snap on top for opening and reclosing packet aslo attached is picture from USN equipment catalog note: tie tapes for attachement to life vest the AAF vesion was cemented between bladders an wearers right