I think by appearances and your description your vase and the Ebay one are 'crackle glass' - "The parison is rolled in moist sand to condition the surface, then plunged in water to make the surface crack. A new layer of glass is added and the cracks fused" (from Miller's Glass fact File) which also warns not to mistake crackle glass for 'overshot' glass.
All iridescence is an applied technique obtained by spraying different metal oxides onto the glass - that would go for 'Tiffany' through to â€˜Ditchfieldâ€™link
I think your item, better seen in the eBay picture is a lovely piece of crackle from the 1920s â€“ 30s. The motif is very deco with as you say a hint of nouveau.
It is very architectural to me and I sense a Czech/Austrian influence â€“ the motif itself is very secessionist.
I canâ€™t give you a company name right now, but I am sure dedicated collectors on this board will be able to help.