Justin uses a Gretch Corvette, most likely a 62/63 in his at home stream for the bernie sanders online rally.

A 1963 Corvette is featured in its own page on Gallagher's official website, in which his brother Donal recalls its acquisition. It is also mentioned in an interview in Kerrang No. 15, May 6-19 1982.

Gallagher's website

Purchased for $50-80 in a Pawnshop in the late 70s. This eventually became a substitute guitar for the Esquire.

At present I’m using a Gretsch Corvette for slide instead of the Esquire. The Corvette is Gretsch’s attempt at a Les Paul Junior, but I took off the Gretsch pickup because it was too weak and I put on a P90, which is an old black Gibson single coil pickup.

Beat Instrumental, March 1979

But for most of the open tuning things I’ve been using a Gretsch Corvette with the heavy strings. It’s a very tough guitar —my brother got it for me for 75 dollars in a pawn shop in Los Angeles. I took the pickup off that and put a P90 on. I should have hung on to it, in retrospect, because they’re very good pickups — similar to the Tennessean. But, in my opinion, the P90 is the best pickup for slide —it has the right overtones.

Guitarist Magazine, June 1987

Donal Gallagher:

While on a guitar shopping therapy session in downtown LA, we went into a store called Guitar Village, after a few minutes of the other customers blasting the same guitar riff over and over through mega amps, my head caved in and I told Rory I was going outside to feed the parking meter. Inadvertently, I had parked in front of a pawn-shop so, as an excuse to stay out of the ‘cacophony canyon’, I entered the shop to inquire about the Gretsch guitar wedged into their window.

“That’ll set you back $75” the keeper told me from behind his cell like grill, “You wanna look?” “Not sure I can afford it anyway” I haggled, with no intention of buying it but to waste time. “What you wanna spend?” “Around $50” I replied. Unknowingly I left the shop with a rare Gretsch ‘Corvette’ and put it in the car.

“No luck” Rory said when he finally returned to the car. “I picked something up, but if its no good the case will come in handy” I said and showed Rory what I had bought. “You’re kidding, how much?” he asked “$50” I said meekly “Quick let’s get out of here before they find out what they gave you and want it back” Rory said with glee.

The guitar would become a Rory favourite and would travel in Guitar Trunk 1 thereafter.

Kerrang

'I play a lot of slide guitar too and for that I often use a Gretsch Corvette, which I found in pawnshop in Los Angeles for 90 dollars. Most of the best slide players are dead now. The old bluesmen and people like Lowell George and Duane Allman, but Johnny Winter's still around and Schenker plays a bit and does the Edge in U2. But they're not really in the blues tradition like I am.

Gifted to Brix her in New York by Eric Ambel (Of Joan Jett and the Blackhearts) during her time at Bennington College.

She tells the story in the linked video starting at 8:10

Harry and his Gretsch playing with The NDE

In a feature on Baeble Music, Ash Reiter discusses the 1963 Gretsch Corvette, noting its slim, solid body reminiscent of a Gibson SG. She praises its perfect neck, well-balanced feel, and ease of play, highlighting the impressive sound of its pickups and its compatibility with her pedals.