Cliff,
I have one, from around 1918.
The majority of XI uprights that I have seen are alligatored red mahogany.
I found mine in a local antique shop that does a lot of estate clean-outs... they said it was in an attic, and it was black inside and out with coal / attic dust, and one spring was broken.
When I got it home and cleaned-up, the finish was in surprisingly decent condition, and with the motor repaired and the #2 reproducer rebuilt, it plays very nicely. It is my only oak Victrola, but it really put me on to Golden Oak as my preference for finish.
Since getting mine, most of the oak XI's I have seen, seem to be later models, with the "fat arm", #2 reproducer, and "speedometer" speed control.
An easy way to tell an X from an XI is to look at the record storage doors: the X doors have a scallop at the bottom, and no exposed bottom cabinet rail.
The Doors on an XI are flat across the bottom, and there is an exposed, scalloped rail connecting the bottom of the front legs.
The XI is also slightly larger than an X, but that's difficult to judges unless they're side-by-side.
Thanks for sharing the pics !
Frank