Early Master System

Prototype-V1 1986 Sega Master System

Is this thing really an early prerelease version?

EDIT: even if the seller states this might be a prototype, it looks just like a standard Master System to all of us…

Other stuff:
NINTENDO WORLD CHAMPIONSHIP POWERFEST 1990 INSIDER GUIDE
Raiden Promo Atari Lynx Boxed
Official Xbox Hardware Refresh Test Disc
Infant Development System
Arcade Board Prototype or just random EPROM Chips by American Technos
Italian Vectrex Boxed!