Vintage 1974 De Armond Model1900 Pedal Phaser

Description

Vintage 1974 DeArmond Model 1900 Pedal Phaser. Excellent cosmetic condition, very clean with minimal wear to finish. Untested. Electronics appear to be in good condition.
There are two possible issues with pedal that may need repair (but I can't be sure since I am unable to test it.)
There is a square nylon rod that engages with a small gear to adjust the degree of phase. The top portion of this rod appears to have broken off (see last photo). It does not look like this affects functionality, but I can't be sure. Also, the switch under the pedal is worn, and may need to be replaced. For these reasons I am selling the pedal as-is.
Heavy wrinkle finish cast aluminum housing, 12 inches long, 3 inches high and 4 inches wide. Weighs 3.5 pounds.
This is a scarce pedal, not to be confused with simple DeArmond volume pedal.