Alex
I have now gained access to my Curtiss files and I can give some more specific dates for you.
BuA 9584 c/n 57: del to USN Air Station Anacostia 6 May 1934; USMC San Diego 30 Aug 1935; no date except 1939 when going to the Antarctic Service.
BuA 9585 c/n 58: del to USMC 16 June 1934; again no date except 1939 when going to Antarctica...
Nice film by the way, looks cold.....
Cheers
Stig