Models , both leitz and zeiss. 7x50 as Chris mentioned was the hand held size...most reliable and practical for the job in hand.
Leitz models early "tuna can " type which lacked the drying cells , individual focusing , not central focusing. On this set Km eagle makers code Beh batch number often a "T" which indicates that the lens were coated and size of glass.
A beutzer cap or rain guard is a common feature on german bioculars.
Zeiss models the Carl Zeiss stamp , 7 x 50 , serial number , "T" , often ann "N" which is thought to indicate North Sea service use. Km. eagle.

Some Zeiss sets did not have the brand make but the Blc code , similar marks on them.
types of Zeiss the familiar "binocular shape" with drying cells located in front face...benutzer cap attached by a rubber chord.most sought after types / those often asociated the U-Bootglas 7 x 50 with rubber end caps , in pea gren colour , occasionally in black.
8 x60 Comandes glass a big beautiful ptic best made and expensive !!can forwad some jpegs if anone intereted.