My guess is custom order.
McDermott easily made what you wanted by adding, deleting, or combining the various design elements in their catalog. It seems people rarely took advantage of that as we don't often see them.
They also offered a 5/16x14 piloted joint with stainless collar. Rarely seen.
We see lots of combinations of stains and wraps that were optional.
If I saw this cue for a good price I would likely snag it without question.
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I have a friend who has a custom McDermott from long ago.
I can't remember the series (C or D, I think), but it has a butt sleeve from one model and a forearm from another. I'll look to see if I still have the picture of it somewhere in my e-mail.
The seller did say it was a custom, hence the confusion. The Birdseye in the forearm is pretty nicer than most examples of the d-25s I’ve seen online. Guy is asking for 380$ Canadian, which is a little too steep for me.