Another vase in the same decor as mine and the same colourway (also the same colourway as a more squat vase with flared sides which I linked from De Erbe see link below). The shape of this one at Carters is the same as the one listed as by Ernst Steinwald in blue and amber and listed as Hantich in blue and amber.
All are by the same maker I am absolutely certain.
This one is listed on Carters as by Archimede Seguso but I can't see any of the listing to see what identification source there is for that:https://www.carters.com.au/index.cfm/index/1312-venetian-murano-glass-housewares-vases/
https://img.carters.com.au/640x640/b0b5fbe6d2dec966dbb6fef26251fd02.webpLink to photo of my lamp here for ease of comparison:
https://www.glassmessages.com/index.php?action=dlattach;topic=49627.0;attach=140026;imageHere for comparison my lamp base plus the others I've found in this decor, one in the same colours as this and my lampbase, the others a different colourway:
https://www.bohemianglass.org/katalog/vaza-merletto-4800/detail/https://www.bohemianglass.org/images/preview/1558/1558620431_dsc00104_315_392_exact_watemark.JPGhttps://deerbe.com/unt/90612-vase_wmf_ikoro_unika_entw___karl_wiedmann_zugesch___art_deco_deko_wabenoptik.htmlhttps://deerbe.com/imgs/a/f/e/a/z/vase_wmf_ikoro_unika_entw___karl_wiedmann_zugesch___art_deco_deko_wabenoptik_1_lgw.jpgAnother described here as Hantich:
https://www.thegildedcurio.com/item-Bohemian-998.htmlhttps://www.thegildedcurio.com/images-medium/998-a.jpgSo, in summary we have one listed as by Archimede Seguso but no source id. - Carters
One listed as Hantich - Gilded Curio
One listed as by Karl Wiedmann for WMF - De Erbe
One listed as by Ernst Steinwald - Bohemian Glass.org site
Mine