[Milsurplus] bouy id

[jedifox]

hi group, 
         i have an unusual item i need assistance with i suspect its a
Magnetic Anomily Detector Bouy  markings on the top of case as follows
:-

                         T 1945
X                                                                                       
10D/17758
                    serial no-59***[serial mis-remembered]

markings around the rim DA811U   2534 54[possible lot no and year of
mfr]


has a coil at the base that detaches on impact on water 

its valve line up is as follows

CV-820[3S4] x 2
CV-807[CV-2300] x 1
CV-2742
CV-2795 x 2


i hope that some one can assist me 

thanks for your valuable time

highest respects

leigh