I have a Lever Scout base just freshly removed from a Marlin 1895M 450 magnum. The system is used but includes all parts (base, two action screws and the replacement dovetail base and screw).
Its not banged-up but the screws were a bitch to get loose and they suffered a bit.
I'll take $30.00 for the setup or trade for something equally useless.
I'll take and post pictures if anyone wants some.
The system is as seen in the top image from this link.
AO Sight Systems - Lever Scout Scope Mount