Just bought my third item in this glass. A previous attempt at identification did not yield anything, but with a constantly moving crowd and ever changing insights, I thought I'd give it another spin.
The base colour is amber - except the one on the left has a high Uranium content and shines like mad under UV. The other two items do not. Decoration is schwarzlot wavy lines combined with transfer (the Breughel figures swilling beer on a stool), cold enamel floral (the decanter with the 1930s shape) and hot enamel heraldic (the curious shaped ashtray).
As the technique changes, it may have been in production for a longer period. The Breughel figures suggest Belgium, someone else whispered "Wmf" - but so far it has everybody stumped. Closest living relative may be "Napoli" glass as described in Revi, but never sighted in the real world....