Old Lincoln Caverns Souvenir Compass from my Local History Collection

I love finding vintage or historical local items, from within state to my town, the closer the better. I formed a collection of these items over the past few years, and will show a few favorites. This is an old souvenir compass made of brass and glass with printed paper dial. Lincoln Caverns in Huntingdon, Pennsylvania opened June 25, 1931, and is still in operation today.
I'm having trouble placing a date on this compass, but would like to believe it was first few years of operation: )

Here is the Lincoln Cavern History Link if interested: http://lincolncaverns.com/pages/history