You know, after posting over 100 wheels (!), I've come to realize that there are two types that are vying for the Most Uninteresting Wheel designation: calendars and profit computers. Sometimes, the profit wheels have fun subjects (the Pork Costulator) and others have no subject at all. And by "no subject at all", I mean this one: the Prestolog Profitmeter.
I guess the only remarkable thing about the Prestolog is its age (copyright 1918) and its material. It appears to be made of celluloid -- a heavier version of that stuff those old-fashioned stiff shirt collars are made of. You know, the ones my grandfather wore when he had to look nice. You can see from the picture below how warped this stuff has gotten. I do wonder about the 7197 printed in the center.
I can't imagine you're particularly interested, but this wheel is six inches in diameter.