17in1 Mac OS installers (available OS: Sonoma, Ventura, Monterey, BigSur, Catalina, Mojave, High Sierra, El Capitan, Yosemite, Mavericks, Mountain Lion, Lion, Snow Leopard, Leopard, Tiger ). The HDD contains a copy of 17 Mac OS installers ( Bootable versions + detailed installation instructions with text and images ).
eBay