Mine is configured thusly
(edited to add) @SICbass
I've colour coded the pots as mine are in completely different places to yours and also neither match @Happy Jack's description 😃
Upper front - volume, no indent, green
Lower front - pan, indented, blue
Upper rear - bass, indented, red
Lower rear - treble, indented, yellow
Judging by the tape it's been apart at some point...