I am assuming that as Martin introduced the "Authentic" series to meet the challenge of Collings stock offerings, then Collings responded with their T series.
There are no quality issues with the Collings standard series, and they are certainly no issues with their standard versions as far as I'm concerns, although the neck profiles have tended to get thicker over the last twenty years.
According to their website the T series has an even lighter (and so more delicate) finish , "animal" protein (hide? fish?) glues, and probably a lighter bracing/strutting build, which makes them even responsive and even more fragile.
The extra cost of the Martin Authentic series has been said to be at least partially due to higher anticipated warranty claims and it might also be the reason that the T series cost more, but they are competing both on quality and price points.
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Silly Moustache,
Just an old Limey acoustic guitarist, Dobrolist, mandolier and singer.
I'm here to try to help and advise and I offer one to one lessons/meetings/mentoring via Zoom!
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