Keith, good luck with your research, there’s very little information around on Greener as only one pottery gazette advertisement exists which only shows one range of a daisy button pattern. Luckily your glass has a trademark which is really helpful. Thanks for sharing. Greener was prolific in creating lots of designs and styles but didn’t mass produce them on the same level as Davidson or Sowerby and was also hap hazard with trademarks so your glass is a great example. Regards Mike