How to check to see if gas stove has been...

Question

This is an older stove I bought at an auction for our hunting camp. It's a Caloric RLS343. I can see that it is marked on the label that it was set in the factory for natural gas. I was wondering if there was any way for me to check to see if it had been converted to propane already? I have tried to find some info on the net about converting stoves to propane, and was wondering if this model was one I could do myself. It has a little square regulator under the lid. But I couldn't see anywhere where you could adjust it. Maybe it needs to be replaced? Any input would be great.

Thanks

Denise