Heath Schlumberger frequency Counter SM-104 F*S Optical Flat It looks like new and

It looks like new and includes the original manual

The lid fits both the outer and the inner pan

This shows 60 years of retail wear with the usual surface scratches to the wood

These lenses were made for the US military during WWII to mount in K-21 Aerial cameras and used in reconnaissance missions

The top is removable if you want to stash something inside

Heath Schlumberger frequency Counter SM-104 F*S Optical Flat It looks like new andSM 104A counter provides the same range and readout as the SM 105A, but has a research grade TCXO time base guaranteed stable to 1 part in 10E6 per year and 5 digits of TTL compatible BCD output. Tested and working perfectly. F*S