Dating guitar ibanez
Supposedly one of the employees of Jordan brought in a Big Muff Pi and everyone in the shop loved it.
There is not much infomation available about Jordan, but their amplifiers were very well know among musicians in the 1960's, being used by The Yardbirds, The Doors, and the Mamas and the Papas.
Feedback resistors were low 220k to 270k, values very uncommon in real Big Muffs.
Many of the other resistor values were uncommon as well.
On the middle-left is the Jordan Gig Wa-Wa, built into the same style cast aluminum enclosure. Targ & Dinner was a Chicago based wholesale musical equipment distributor and retailer, and would later have their own branded version of the Big Muff, the Marveltone Distortion Sustainer.
Shown above - A variant Creator circuit with 560p F feedback/filter caps, rather than 500p F found on other examples.