John, very nice drum. It's a bit unusual as it has a tone control. Most Studio Models did not have tone controls. The Orchestra Tuxedo Model offered the tone control but it also featured the Aristocrat strainer which yours clearly does not.
Steve, leedy - no extra holes in this one, the throw-off/butt-strainer/tone control are all original to the drum. Nothing appears to have been added afterwards.
Do you think it may have been a special request from a buyer? Did Camco do little custom modifications at customers request? Now you've got me curious.
I'm loving it! The drum sounds rock solid, has amazing tone and is one pro-quality instrument sound-wise. You guys know much more about these drums than I do. Tell me what you can, please. I want to learn more about Camco/Geo. Way. Any good books out there you can recommend?
John