You sound surprised that this came from Scotland, is that unusual? I am going to see if I can magnify the reverse to see the writing, I will let you know what I find. Thanks for replying.
Surprised isn't the word ...intrigued more like it.
Domitian withdrew the legions from southern Scotland around 86/87, just a few years after the battle of Mons Graupius. It's interesting your coin may date to that time period.
If you can make out anything more of the legend please let us know.