I purchased this scissors at a flea market last weekend, basically because it looked weird.
I thought it might be ambidextrous, but after playing with it a little, and doing a bit of research, I realized it is not a genuine ambidextrous scissors. But it is an interesting design.
Simply putting a thumb and finger ring on each side does not make an ambidextrous scissors. Otherwise any scissors with symmetrical ring holes would be ambidextrous. For a scissors to work properly, the top blade must be attached to the finger ring, so a scissors has to be right or left handed. This arrangement accentuates the natural action of the hand as it closes, so the cutting edges are squeezed together. If a left hander tries to operate a right handed scissors, the natural action pulls the cutting edges apart, putting the action at a mechanical disadvantage. So a genuinely ambidextrous scissors is a mechanical impossibility, at least if it operates with thumb and finger rings.
Secondly, there is a discrepancy between the patent drawing and the actual product. The patent drawing shows the curved areas of the rings that could be used right or left handed. The actual product uses the same shape on each side, making it uncomfortable to use left handed. Would this difference invalidate the protection of the patent? Possibly this was done to save money when making the mold for casting.
Nevertheless, I decided to clean the scissors and sharpen them. These scissors are very comfortable and convenient to use by right handers since it doesn’t matter which way they are picked up.
After taking them apart, I immersed the scissors in white vinegar for four hours, occasionally removing surface rust with a Scotch Brite pad. I’m amazed at how well the vinegar works, and still surprised how satisfying it is to fix up a tool, returning it to useable condition. It just feels good.
If you are interested in the “proper” way to cut paper with scissors, check out this 1927 illustration from Palmer’s A Course in Bookbinding for Educational Trainning
Miriam Schaer (see first comment) sent me this photo of a lefty scissors (note the top blade attaches to the finger rings), with even weirder placement. I can’t make sense of where you would put your fingers.