Odd 18th Century Dirk?

[MacMillan of Rathdown]

Has anyone seen a Dirk like this? listed as Scottish 18th century Dirk?
or am I missing something?

I doubt it's Scottish. It looks like a kama, the type of dagger worn by Russian and Georgian cossacks. Judging by the nielo work on the hilt I'd guess it dates from the late 19th or very early (pre-Russian revolution) 20th century.