All the OM1Ts were remarkably consistent. All but one had baked Sitka tops; one was Adirondack. The earliest (2016) had the most playing time and had opened up beautifully, with a really lush feel to the bottom strings. I could have been deliriously happy with any of them, but I got stuck in a quest for the perfect neck profile.
As I've gotten older I learned that my left hand very much prefers a deeper profile, especially since I play thumb-over chords a lot and a deep profile permits a gentler (less-acute) bend in the thumb (and first finger). It took me a while to figure that out. Collings has used several different profile depths on the Traditional Series, starting with around 0.90" (1st fret) in 2016 and ending up at the current spec of 0.815". I liked all the Traditional necks I played, but my left hand was much more comfortable with the deeper profiles. When I acquired an OM1Mh custom that had been built with a VN neck (0.845") I knew I was getting close to the ideal; the VN felt great, but I wanted something just a little deeper. I was fortunate to find a dealer who worked with Collings to build me an OM1T that started with a VN profile, but they tweaked the depth of the CNC carve by +0.015" to produce a neck that's 0.86" at the first fret (0.845" + 0.015"). Perfect! Collings said that because the Traditional neck uses the VN profile as the basis for its shape, they were willing to build me an OM1T with a modified VN neck and still call it an OM1T. Now I have the perfect OM1T. It was beautifully balanced to start, and it's just now beginning to loosen up and show some of that sweet lushness in the bottom strings. It's fantastic, and it fits my hand perfectly. Couldn't be happier.