WORKING CONDITION: Poor. It does produce an effect, but none of the MODES work completely and some do not work at all. The MODE switch should be a 4-position, but it has been modified to a  7-position switch and as seen in the pics, the marker does not line up with its desired functions, but you turn the knob and it clicks into 7 distinct posiitions. Also, the Blend  / On switch seems to have no effect on the signal path.

PHYSICAL CONDITION: Good- It shows considerable wear and scratches but all the parts internally and externally are intact. 

INVENTORY #59356

BRAND: Electro Harmonix

MODEL: Poly Flange

FUNCTION: Guitar Effects Pedal

PRODUCT DESCRIPTION: This listing is for an Electro Harmonix Poly Flange Big Box AC Cable Guitar Effects Pedal. The Electro-Harmonix Poly Flange (model EH-7700) is an exceptionally rare, vintage multi-modulation analog effects pedal produced in the late 1970s and early 1980s.

SPECS:

• The "Identical" Trio: The Electro-Harmonix Echo Flanger, the original Poly Chorus, and the Poly Flange share the exact same internal analog circuitry. They were simply rebranded and renamed by EHX in a short span of time. 
• Vintage BBD Circuitry: It relies on two rare, legendary Reticon SAD1024 Bucket Brigade Device (BBD) chips. These chips provide its signature warm, organic, and beautifully imperfect analog sweeping tones.
• 4-in-1 Functionality:
  • Flanger: Rich, liquid, and chime-heavy sweeps.
  • Chorus: Lush, deeply modulated analog spatial chorus.
  • Filter Matrix: Disengages the LFO sweep, turning the flanger into a manual, static comb filter.
  • Double Track: A very short slapback analog echo tracking up to ~100ms.

ACCESSORIES INCLUDED: This item comes as seen in photos and does not include any accessories.

UNPACKAGED WEIGHT: 3 lbs.

UNPACKAGED DIMENSIONS: 8" x 2" x 7"