Rarely seen USED Maxon AD10 BBD Analog Delay . Pure Vintage Analog Tone. 
Up to 600ms delay, easily goes into self oscillation from about 3 o'clock & beyond 
In excellent + condition, , some very minor tarnish. 
100% working order, no noisy pots or switching. No velcro residue.

Full Specs;
Offers distinctive analog delay sound with roundish but forceful tone. 
Creates natural reverb effect which does not interfere with original sound.
Max. delay time 600mSec. is available in spite of the compact enclosure.           
Offers right setting even in slow ballad.
Low-noise design with no distortion. Creates clear and brilliant delay sound for every note, which is also available when combined with overdrive or distortion pedal.

True analog delay with BBD ICs. Distinctive analog aggressive feedback playing is possible.
LEDs to indicate bypass/effect and battery condition for trouble-free performance.
Two-way power operation, using 9V battery or optional AC adaptor.

Made in Japan.