Andrew Nethercott Antiques has dated this piece to the 18th Century.
The capitals also marked with the lion passant.

All hallmarks clear with some wear to the marks on the capitals.
Unmarked, original conforming shell cornered square shaped, good tight fitting removable sconces.
These candlesticks are of the very highest quality, of robust gauge, good colour and patina.

All in excellent condition, all original with no damage or repair.
The hallmarks to the underside very crisp & clear.
Height 8,1/4" or 210mm, gross weight 1072 grams or 34.5 troy ounces.
A near identical pair can be found in the collection of the Metropolitan Museum New York,
https://www.metmuseum.org/art/collection/search/19209
Andrew Nethercott Antiques has dated this piece to the 18th Century.
Works of art, collectables, scientific and decorative antiques from the 17th - 20th century
You can view the stock and full dealer information on the Andrew Nethercott Antiques Profile Page