Interesting & lovely guns.
I too am partial to under levers....I only have one, a nice 1901 Greener hammer Pigeon gun...its the inert, manual hand crank Jones U'L or screw grip action.
I believe later Jones models were made to "snap" shut...is that right??...mind your fingers ...ouch!!!
What initiates the "snap"...the beggining of closing the gun???
I like the look of no top lever
cheers
franc