this combination of blue and brown appears to be rare - and as you'd imagine these duotone pieces need to be pressed separately and then fused together - apparently pieces are known where the colours are reversed for the same design. The only example I can see in the books is in one of Miller's offerings where they're described as 'novelty fusions'. Unfortunately, this material seems to be of uncertain origin, although German moulds and possibly Belgian or French glass is suggested, with a date of something like the very late C19.
Of course, yours may be nothing to do with the period examples, and may be simply a modern piece of coloured glass, but thought I'd mention this just in case. Are there any indications of age?
Ref. Miller's Popular Glass of the 19th and 20th Centuries - A Collectors Guide. Raymond Notley 2000.