Thanks for the info and photos!

Yes none of the modern Pantheon of Highland jackets quite matches.

All of the modern Evening doublets I've seen that have the Inverness tashes and Argyll/gauntlet cuffs either have Prince Charlie style lapels or a high standing military style collar.

The jacket I'm wondering about has a collar like an ordinary suit coat of that period (late 19th and early 20th century). It is worn with a waistcoat. Like ordinary suit coats of that time, it's often worn with only the top button buttoned, but at other times with several or all buttons buttoned.

Here's an example with a collar/lapels more like the "Regulation doublet".



Anyhow the style under discussion couldn't have been called Montrose or Regulation or whatever because these terms weren't used then, as far as I can see.