1958 Jensen P10R smooth cones (quad - two with bell covers & two without)

I've just come across a quad of 1958 Jensen P10R speakers with smooth cones. Two have bell magnet covers and two do not. The guy I got them from said they came out of his grandfather's amplifier. So, I'm guessing they likely came out of a Bassmen. I grabbed them thinking they'd be great to have around as spares for my 59 Bassman. But, also contemplating the possibility of flipping them. What is a reasonable asking price for these as a quad or individually? If anyone has interest in these, shoot me a PM.

Thx,
BW