We don’t have the Wireless Set or the Battery Charger that went in this transport case, but it is still a nice artifact.
The Yokohama Radio Museum has a Navy Type TM Wireless Set.
Transport Crate for Japanese Navy Type TM Short Wave Mobil Wireless Set Improvement 4 Battery Charger
This transport case held the battery charger for a Japanese Navy Type TM Short Wave Mobil Wireless Set Improvement 4.