looking around for some/any other group or period with which to try and make a comparison, I've looked at some of the pieces in Ruth A. Forsythe's booklet, where you can see the extent to which the 1920/30s were influenced by this Nile-based form of decoration. Unfortunately though as far as Forsythe goes it's almost exclusively on ceramics that she shows this Egyptian style, and I think safe to say none of it carries any symbolism - just rather plain and obvious middle eastern BC designs.
I agree the symbolism of the outstretched arms/hands is puzzling - quite unusual - but may just have been a quirky approach by the artist.
Obviously the piece here has nothing to do with cloisonné, nor the aesthetic movement - wasn't that all about the Japanese and Whistler

Your right hand side in the link is of course 'Egyptianesque', but I don't see any connection between the two - Carter hadn't yet been to the valley of the Kings - and although that event was a major reason for palm fronds and weird looking cats etc. appearing in art, some of the reason for it's appearance was a resurgence of the Empire period, when Napoleon toured the middle east relieving the natives of their ancient relics.
The immediate appearance of this piece strikes as odd - it appears to lack any counterpart in the glass shapes in Forsythe's booklet, which shows pieces from 1918 - 1938 ish - the decoration lacks any similarity too, with Forsythe's pieces, so appears out of character with material from Czechoslovakia - but maybe a one off perhaps, and have to remember that art deco shapes are many and varied.
I'm still of the opinion that the outline shape of this vase combined with the Nile-related style of decoration puts it post 1918 - and quite possibly, unfortunately, you may never progress further.
On the face of it this looks to have lived a sheltered life - the painting appears very good still - I don't mean to be a 'doubting Thomas' but is there a chance this is a modern production??