Vintage Rare Frazier 3100C Passive EQ Equalizer 1970's Tested Working Grommes

Description

We are selling a super rare Frazier Loudspeakers model 3100C passive EQ equalizer unit.  This EQ was tested by a tech and is working as it should.  The input requires a 600 ohm load to operate correctly.  This unit appears to be similar to a notch EQ and likely made to cut frequencies that would cause feedback in a sound system.  Has some wear from use like scratches, scuffs and dust.  Sold AS IS, please see high-res photos for more details.
Research suggests that Grommes made equipment for Frazier and possibly this 3100C?
Model: 3100C
Serial #: 63274
Photo #11 & #12 = Shows what happens when you max out frequencies 100, 400, 1K, 4K, 8K
Here is what the Tech had to say:
The Frazier piece is pretty cool.. It relies on a 600 ohm source load in order to work correctly.  The Lo-cut and Hi-cut are the most useless controls.. and act broadly across the range.  The other controls are pretty high Q and provide up to 10dB of cut at the center frequency.
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