You can probably find details of hookup at the sites I referenced earlier.
Any battery of the correct voltage and current rating would work. You need to check the specifications of the battery in use. If it's a 1.5v battery or multiple you could use "D" cells. Battery holders are available on Ebay or at electronics goods retailers (used to be Radio Shack).
The handset was probably a carbon microphone and a dynamic earpiece. This will be a bit trickier to obtain.
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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