Let's see if you guys can help me.
There's a live show called "Brothers of a feather" from Chris and Rich Robinson. Rich uses is Esquire in some songs and I can't see any pedals or effects going in front of the amp. The amp seems to be some Fender Hot Rod:

(the image is taken from the DVD)
but it doesn't sound like any Hot Rod I ever heard. It has some "tweed caracter" on it.
I can get close with my modded Champ 600 through a 1x12", but not with that amout of "grit".
Does anyone has some info on that amp?
If you don't know the album, go get it. It's one of the most amazing sound I heard from an Esquire or tele bridge PU.