OS-51/USM-24C Navy Oscilloscope (mid 50s vintage) Looks and works good. Rated at 11Mhz (military specs so is proabably very conservative) Comes with the complete original operation and service manual and one original probe. Free, but you must pickup in the Dayton, Ohio area..no room, hate to see it go to the land fill.... Happy New Year Tim Nz8J