Plexi, I found something yesterday you might be interested in.

Short version; read the blue.
I read an old Guitar Player interview with Rory yesterday (http://jasobrecht.com) in which Rory says his tweed bassman was a 1955. 
That would make it a 5D6 or 5D6-A now wouldn't it?(dating info from "The Soul of Tone, Celebrating 60 Years of Fender Amps, by Tom Wheeler.)
Now wait a minute, hold the phone! This changes everything, well in my mind anyway.

It's well known that Rory played through a tweed bassmen (and/or tweed twins) for
many years. Yes along with AC30's, Marshall combos and even a Brown face Concert 4x10 for a while.
But "Irish Tour's" sound IS that amp (well either 1) with a rosewood neck strat. (Possibly with a range master duck taped to the top of his main amp. He did use a range master in his early days with his band Taste when he played an early AC30. I have several DVD's and on at least one of them for a brief second you can see a pedal(?) taped to the top of his tweed bassmen. I'll have to go through them all
slowly again watching for this.)
But I always thought it was a 58/59 TB/TT, as I think almost every one did. 
I'm a big fan of Rory Gallagher and Irish Tour Live is on my top 10 albums of all time. I saw him live at the Argon Ballroom in the winter of 75(?), it was just a couple of weeks after Howlin Wolf (50's Chess Records blues star) died and during one song just before he started his lead Rory ran up to the mic and hollered "this is for the Wolf" and took off into a blistering impassioned solo which included his version of Chuck Berry's duck walk. I can still to this day see it in my mind but that was why those of us who loved Rory's music, who were
touched by it, were
drawn to it and
moved by it, his ability to mix raw soul/passion/emotion yet had the technique/skill and chops to pull it off, so it wasn't just bashing.
It was a long time ago but my friends and I were musicians and we would
ALWAYS as teenagers in awe of the big boys would scope out what gear was on stage with great intent as far as what we understood at that point. (I remember seeing an English band at the Argon and the lead guitar player had a
red "Park" amp head! We looked at that up on stage sittin on a speaker stack and looked at each other and nobody new what it was.

)
But here's where it get's foggy, but I sure do remember that Rory had at least 4 "stacks" or maybe 5, of tweed amps.
I can't for the life of me remember if he had 3 tweed twins on top of 4, 2x12 tweed bottoms sitting up right or 4 tweed bassmans sitting on top of 5, 2x12 tweed cabs? I do remember the stacks were all the same height, they looked
well road worn and had torn grill cloth.
Almost
ALL the lead players that I remember back then had their amps "stage left" so from the seats to our right, as did Rory, next to the drummers hi-hat/snare, which was opposite of almost all the bands before. They
always had the bass player right next to the drummer's hi-hat/snare for eye contact. It was and is still sound logic in my mind, but the rock thing had a different driver relationship between the drummer and himself than the older styles of American music. rock guys want to drive the music and the older forms "floated on top of the bass/drums and didn't
drive it, they
road it like a surfer on top of a wave. (Hey JJ you out there buddy?)
There's no way to know at this point IF Rory used 2 5G4's or 1 GZ34 in his 55 bassmen but I will be looking for if I can SEE on any DVD's I have IF the tweed aps on them have a mid control!All in all I think you sir found a real gem, which has already been proven even if Rory didn't play one! Brad