For sale: Vintage Draeger divers communications sets. These sets are shipped sealed in the original german army package where they have been stored in since 1972. The set takes a 3 volt battery with nato code IEC 2 R 10. I doubt if these are still available but dare to believe that you can modify the set for the use of 2 AA penlight batteries. The plugs that fit this set are still available from Amphenol, these are 5 pole C70B connectors, code T3012002. Price for this communications set is 30 euro plus shipping.
Draeger Taucherfernsprechanlage T5520