Rotary switch lug numbering

[armdnrdy]

I'm working on a project, trying to decipher what's going on with an old style rotary switch.
(Edit: I'm working from images I gathered from the net so...I can't meter the switch)

The switch is low profile, very similar to the MXR Phase 100 switch.

I've figured out that it's a 2 pole, 4 position switch, but I can't figure by the connections which lugs are the commons.

There are 5 lugs on the top and 5 lugs on the bottom.

Maybe one of you has come across this type of rotary and can help me out with the lug numbering.