Help identifying an Old Scottish leather gorget?

[Derek]

Hello forum members,

I am new the forum and would like to share a most intriguing and very old artifact I came into owning and am seeking help on properly identifying it.

It is all original, and I believe it to be a coachman driver's leather gorget or a military gorget with what appears to be a sterling silver (with very old patina) family crest of the Scottish clan Stuart? surmounted by a 'marquis' crown?

The crest has two griffin's and the upper central animal is a lion with a very small scroll on both sides that say 'Nobilis Ira' (Something to the effect of 'Noble is the lion's anger/roar')

Around the circular badge is also the script of "Nemo Me Impune Lacesset'

Below the circular badge portion is, what I believe is St. Andrew with the cross.

Dimensions of mine are:

Height: 6 1/2"
Width side-to-side: 7 1/2"
Thickness: 1/4"

Not sure if this gorget was worn by someone in a Royal Scottish Highland Regiment, Black Watch etc or maybe it is a coach drivers gorget for someone in the aristocracy.

I am guessing is might be mid 1800's or possibly earlier? it is in fabulous condition. The leather was dry when I purchased it, so to save if from eminent death, I have been very slowly and carefully nurturing and feeding the leather to a point that it is stable with Antique Picard leather conditioner. I was lucky enough to save this in time from the previous owner, as the leather is responding very well to minute applications. I believe I have historically saved it in time so that it will live on for many more decades to come...it will outlast me. One has to be very careful with very old leather...slowly and just the right amount only.

Questions:

Might anyone know who this might have belonged to or it's relationship to military or maybe nobility?

Is there a method of identifying to whom this gorget was issued and what timeline or date in history it falls within?

Many thanks to anyone who is willing to share.

Kind Regards,
Derek