This is the classic American made volume-wah pedal from the 1970s.  This one is in fantastic condition, especially considering it is 40 years old.  These thing are built like tanks and can hold up to touring without a problem.

A copy of the original owner's manual is included with purchase.
 
“The MU-TRON C-200 VOLUME-WAH PEDAL features volume and wah functions that can be used indepently or in combination. A trim pot on the side of the pedal provides a gain boost of 0 to 10 db, and two LEDs indicate the status of the effects. The unit is AC powered, guaranteed to provide uniform operation over all normal temperature and environmental conditions, and boasts studio quality sound.”
– From original Musitronics C-200 Volume-Wah product sheet circa 1970s

Controls:
Vol foot switch enables the control of silent to full-volume volume sweep (via foot pedal)
Wah foot switch enables the control of filter sweep (via foot pedal)
With Vol and Wah foot switches enabled, both functions are simultaneously controlled (via foot pedal)
Specifications:
Input Impedance: 390k ohms, unbalanced
Output Impedance: 600 ohms, unbalanced
Trim Pot: Gain boost of 0 to 10db
AC Power Requirements: 115V AC, 60Hz
Dimensions: 11½” l.  X  3¾” w.  X  3″ h. (in closed position)
Weight: 4 pounds