If you do an advanced search on Ebay sold listings,you will see that the Rogers can fetch as much as $5000 and the Spendor over $1000. If the Rogers are the gold badge 15 or 11 ohm version then you have gold . Of course condition is a big factor ! Both of those are very collectable. It looks like both pairs have been converted to bi-wire ( not original ) and might effect the value !
Good luck !
Good luck !