Mdina Tortoiseshell doesn't have the frothy yellow background - it's just browns and reds, blobs and streaks with silver nitrate effects (Silver nitrate turns red glass brown).
This is Earthtones - the execution of the design has many, many variations and several quite distinct "hands" can be posited - including that of Vicente Boffo, but this isn't one of his.
Earthtones (A Michael Harris design) is still made, but now called Earth.
The shape of your bit is known as a "Bullet" bowl, I believe these are mostly quite early, but I can't say exactly - I'd imagine pre-'80s. It's quite finely blown, so definitely post Boffos arriving.