This is an English art glass jug or vase. The date is the later part of the 19th century, circa 1860.
Dark red glass with white casing gets identified as Bohemian – Harrach quite often. Others have told me the vase is French. I will take a few sentences and explain why the jug is not Harrach and not French. For one, the rim is round and Harrach’s cased oxblood red glass is typically polished flat with beveling. Second, I refer you to the book “Victorian Decorative Glass British Designs 1850 – 1914” by Mervyn Gulliver, pages 240 and 241, showing photos of a jug shaped identically to this jug in all respects, including the roundness of the rim, the shape and placement of the handle, the shape of the mouth, and the shape of the neck, belly and the foot. The jug featured in the book is dated to 1860. The author also states that the jug has some lettering/numbers on the underside, just as this jug does.
The English glassmakers were adept at not having their shapes copied by other regions, plus they also had a passion for producing jugs of all types and shapes.
The jug is 10” high and about 6” wide at the belly.
The outside glass is a deep dark red that appears black in most light, and some might call oxblood. It was very difficult to photograph, and I apologize, but in most of the photos that glass appears black. The inner glass is a solid white opaline or opal.
The jug has a round foot and an even rounder belly. The neck is narrow and flares into a small mouth. The handle is applied. The rim is wide and rounded and there is a slight spout. The inside has a narrow hollow because the neck is slender.
The decoration is hand painted or hand enameled, mostly in raised gold. The primary decoration is one of fern leaves stretching around the body of the pot and up the neck. There are sprays of leaves and flowers painted flat, and not raised. There is gold trim around the edges, the neck, the foot, and the bottom. The handle is covered in gold also.
There is some wear to the gold decoration. There is rubbing age wear to the gold trim around the mouth and handle. There are some rough spots on the inside of the mouth and one small dimple in the glass. The bottom has some of the same rough spots, and these appear to be burst air bubbles. There are scratches in the bottom due to age and wear, and one tiny flake. There are some scratches on the red glass that can be seen in a strong light, due to age and wear. There are no chips, cracks or nicks.
On the bottom painted in brown or red enamel is 936 underscored by 4., followed by L.295.