Looks like a hot potz II, which puts it in the early 90s. Most likely a 1408P. Looks like a stock barrel connector to me...though it's possible that it's a modification.
That was a good era for crybaby inductors. Anything late 80s-mid 90s, really. In the late 80s they used a Magnetics type F 1811p. 90s...dunno the exact grade, but I know that they used an N30 1408p on some when they started making pedals for budda. I'd venture a guess that they used N48 for a while.
I see two possibilities: either it's an older 1811P variant from the late 1980s that was modified with a barrel plug instead of a 3.5mm input and a new pot, or it's a stock model from 1992 onwards. Can't remember if he used much wah on their self titled in 92, but I know it's all over evil empire.
His signature model is a GCB-95 with a paint job, unfortunately. Typically a stock toroid inductor: honestly, I'm not super impressed with dunlops toroids...but they're a fair sight better than the blue and black cans they used in the mid 80s.