I would estimate it to be a late type 19 or early typ3 20 from about 1962 to 1965. The fact that the blade has never been honed and it is still in the box indicates to me that it was either never used, perhaps received as a gift by someone who didn't want it, or used briefly by someone who didn't know how to use it, and got discouraged. I have picked up a couple of very nice planes in this condition. It's worth the price.