Do gold lunulae found in SW Scotland give us a hint as to the arrival of Celtic Britons?

Just a few days ago, I saw a post from the Stranraer Museum regarding the fragments of a lunulu found near Cruggleton, Wigtownshire, Scotland. If you aren’t familiar with what a lunula (plural = lunulae) is… I recommend a quick look at Wikipedia’s entry for “Gold Lunula”. Here’s what Stranraer Museum had to say about