GolfOMeter - Golf Gadget of the Month?

It's an odd little instrument... and I'm not really sure what it does... so it may not be worthy of the prestigious Golf Gadget of the Month designation.

From what I can see, though, this rare vintage "New Haven Golf Meter" measures yards and miles. I don't not know how it works.... or... if it works, but it looks like a pretty awesome collector's item to me.

If anyone reading has used a Golf-O-Meter, I'd love to know more about it.  It might just help me to take my game to the next level this year.

Or not.