RARE Antique 18th Century Portrait Miniature TS Snuff Box, English Gentleman, 18k Gold Mount

One of my all-time personal favorites, this magnificent little work of art is of top quality, subject and artistry, and yet I find no signature. An important man of his time, given the look on his magnificent face, mid-1700s gentleman leans on a table upon which his own snuff box is close at hand. Paintings of gentlemen with snuff box are rare and sought after, large or small. For a snuff box collector, sublime! The box is a pristine and heavy natural tortoise shell, lathe crafted and perfect. A fine quality, thick polished cover glass and a heavy double mat mount of 18k gold, tinting to rose/pink gold. In its entirety, just superb. Full measurements noted on the photos. Very good to excellent condition throughout. The painting is truly magnificent - that gentleman's face, self-satisfied, his cleft chin, 5 o'clock shadow, even his cheek mole captured. Hair and clothing, he is well into detail for c.1750-60s, side curls a long braid tied with black bow. He may well be English - just a f