For your consideration, here is a Vintage Form-A-Pat Aluminum Hamburger Patty Forming Press, Made by Spencer and Co., of Portland, Oregon.  It has an outside diameter of 5 inches.  It has a little wear on it.  The hinge works fine.  It will be mailed in a box for protection.  Item pictured is the actual item up for sale and comes from a non-smoking household.  (378.822L-.13kx2)