Folks,
We did some research and have put together the basic information on the TBTs, and the waterproof binoculars used for both the TBTs and later 5" 25 cal wet mount guns. These should make restorations much easier:
https://maritime.org/doc/pdf/telescope-mark-90-91-op1398.pdf Telescopes Mark 90 Mods. 0-1 and Mark 91 Mods. 0-1, Principles of Operation and Instruction for Shipboard Maintenance, OP 1398, 1946. (8.4 MB PDF) Describes the waterproof binoculars.
https://maritime.org/doc/pdf/tbt-mk8-op1189.pdf Target Bearing Transmitter Mk 8, OP 1189, 1944, (21 MB PDF) shows the Mk 90 waterproof binoculars in the TBT.
https://maritime.org/doc/pdf/tbt.pdf Target Bearing Transmitter Mk 9, OP 1148, 1945, (10 MB PDF) shows the Mk 90 and Mk 91 waterproof binoculars in the TBT.
https://maritime.org/doc/opticalcat/vol3sec2sh057.htm Optical data catalog page for Mk 38 TBT waterproof binoculars
https://maritime.org/doc/opticalcat/vol3sec2sh062.htm Optical data catalog page for Mk 47 TBT waterproof binoculars
https://maritime.org/doc/opticalcat/vol1sec1sh203.htm Optical data catalog page for Sight Telescope Mk 90 waterproof binoculars
https://maritime.org/doc/opticalcat/vol1sec1sh204.htm Optical data catalog page for Sight Telescope Mk 91 waterproof binoculars
Most of the drawings for a Mk 90 binocular are available, search for telescope in:
https://maritime.org/tech/drawings/fiveinch/
