Help with Antique Sgian Dubh Provenance

[O'Neille]

I'm hoping that the learned populace of xmarks can help me with dating and identifying this little treasure. I purchased this for myself on Ebay. I have no indication of it's history other than I got it from an ebay seller in Florida. Any help will be greatly appreciated.

I liked it from the moment I saw the listing. I had to have it. I wanted it so I could see the assembly detail and make a copy for general use.

Total Length 6 5/8 inches

Blade 2 7/8 x 5/8 (includes recess into bolster) marked FLETCHER (best guess)

No sheath

Stone 1 x 5/8 (my feeling is that it is a fairly soft amber)

Silver ferrules appear to have been embossed with a fine
stamp. No hallmarks visible. Friction and pin fit to handle.
Very nice carving and patina.

Unknown wood

Total weight 40 grams

I'll include a bunch of pictures and see what I can learn.