The Amp Garage

I spent 5 mins going over the chasis looking for a AO# and couldn't locate anything. The underside has 13 written with a green marker.

Greetings - I am new to this forum and found my way from another forum post saying this Amp Garage group has the most expertise on Hammond amp conversions. I recently acquired a stripped organ chassis with no backstory and am planning to convert this to a guitar amp (with the help of an amp tech). I...