All American SAR- Radios from their beginning to 1968 are part of the collection. More modern ones are (still) too expensive....
 

  PRC-96

(1976) "is the Navy's standard lifeboat radio. This is why it has 121.5 and 243, because the Navy can be anywhere in the world, and you need both of those frequencies, especially 121.5 if you are apt to be far from anywhere.
The normal battery is a 6V lithium. However, Lithium is not allowed on submarines. So, what to do? So they made a round sleeve that screws onto the radio in place of the cap, and the cap screws onto the end of the sleeve. The extra length of the battery compartment now can hold 4 each 1.5 Volt "D" cells." ( " " by Alan Tasker, WA1NYR)
(Sorry there is no such sleeve in my museum).

Testset TS-3527/PRC-96

Frequencies:

121.5 MHz

243 MHz

Channels:

2, crystal controlled

Mode:

AM

HF output:

200 mW

Sensitivity:

6 µV

Battery:

6 V Lithium ( Submarines: see above )

Used by:

Navy

Year of issue:

1976

Replaces:

PRC-17 and URC-4

Replaced by:

current