Canon Unit V-2 in original leather case with Baseless Adapters PH and AG.
Excellent condition.
 
This flash uses an Eveready 505 carbon zinc battery or its equivalent (Neda 221 type). These are still available. Do a search on the 'net or on eBay. However, be aware that this is what is known as a "B-C" or battery-capacitor bulb flash. In addition to the 22.5v battery, there is a replaceable electrolytic capacitor that's roughly the size of a AA battery. Make sure that the battery and capacitor are inserted in the correct locations. Over the years, the capacitor can deteriorate to the point where it will not hold a sufficient charge to fire the flash bulb, even with a good battery.
 
Instruction manual can be found here:
http://www.cameramanuals.org/flashes_meters/canon_flash_v-2.pdf