Sorry, regret absolutely no idea as to provenance/attribution for this vase, but would agree this piece looks to be neither from the nouveau period - c. 1880 to 1918 or even in the nouveau style, but I like the Picasso analogy, though perhaps these horses are a little too realistic for him - much of his imagery is contorted to the point where some imagination is usually required to understand what we're supposed to be looking at.
But if I can add a few thoughts to some of the replies already posted - partly because I usually forget the differences between some of the overlay processes and partly as some might find them of interest - so here are a few words in respect of 'Staining' and 'Flashing':
Staining: Either by means of dipping into a stain or painting the stain on, metal oxides are applied to clear glass then the piece is fired to 'fix' the colour. Think of all those drinking glasses in Egermann 'ruby red', often with cut to clear (wheel engraved) images of hunting scenes.
Apparently the Egermann pieces (Bohemia) were treated with a mixture of gold and copper oxides. He also produced a yellow stain by means of silver chloride, and invented a surface effect to mimic agate, which he called Lithyalin.
Flashing: This is a lower quality process that omits the firing, and involves applying a very thin layer of molten coloured glass to clear glass bodies, again by either painting or dipping - unsurprisingly, the two fuse as they cool.
As far as I'm aware, there aren't any 'enamels' used in either process.
Perhaps not easy to tell the difference between C19 Bohemian and U.K. pieces so treated - apparently there was much British flashed, cased and stained material produced - much for the Great Exhibition in 1851 - though it may have been that Brits. were making a nod toward what they may have envied as a Bohemian success. Of course, if the image is of a boar hunt then the piece might be from that area.
Am I correct in thinking that much tourist ware in this red flashing are still produced in Germany?
Though I'm totally ignorant of modern cheap methods of colouring clear glass, I see many pieces in charity shops where a 'colour' has been inexpensively painted onto a glass body - so cheap it eventually flakes off.
Might this vase have been acid cut, or perhaps the effects of wheel engraving can be seen on the body.