The list was about $2400. Gibson closed and sold a warehouse in Nashville in 2015 in an attempt to generate some cash to stave off bankruptcy (Chapter 11 happened in 2018 anyway). Gibson arranged to liquidate the warehouse inventory through GC. During the second and third weeks of October, GC had amazing prices on Gibson Guitars and basses. That included some new Les Pauls and new ‘13, ‘14, and ‘15 Thunderbirds along with other guitars. See my receipt from 10/24/15. A day that is one of the happiest days of my music life.
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You could get a ‘15 for around $1200 or so during 2016 as some of them got flipped. But the prices went up and hovered around $1500 or thereabouts until 2020 when they became scarcer and started going for close to 2k or more. Yours at $1450 with only a mark on the headstock (mine has one from a ceiling fan) is a great deal. And it will be more collectible as the years go by.
The switches work like a light switch. Down is off, up is on. Both down is full humbucking mode.
I think you will really enjoy it. I know you like flats, but think about trying stainless rounds on it to bring out all the tone from those pickups.
Edit: The list was $2599.00.