Here is what Mike says… 

‘Hawkeye - Guitar Practice Amp

Kodak Portrait Hawkeye camera, dating from around the 30's - 40's.

It's now fitted with a hand wired amp circuit based on the Ruby amp.

Volume control on top, 9v battery compartment and input jack at the rear.

Insert input jack to turn amp on, remove to turn off. 

Truly portable and cool vintage looks.’