We bought this cute Hayes Visible pump last year on our trip to Oregon.. It was wired together and lacked the glass cylinder but otherwise a nice pump. We found a cylinder at the Hershey Swap Meet and finally put it together to display at the Lakeside Storage free Museum. While I'm pretty sure it is the 1921 Hayes version, I don't know the model number. If anyone can help, it will be appreciated. I love the variety of the different models of pumps from the olden days. Yes the pinup in the down coat is my Girfriend and wife.