Vintage Camera Practika 1

I found this camera at a local flea market! My dad and I thought it was awesome so we got it. It's old enough it doesn't use batteries and the original owner was a guy who took pictures out of airplanes from the 60's. I got the lens and cases for it too! I know it's a Practika but I don't know the actual model of it and would like to know more about it. If you know could you please tell me? Thanks!