I found a few vault lights in Tallinn made by а Russian company before the Russian Revolution.

The inscription says: “С.-Петербургское стекольно-промышленное акц. о-во”

The St. Petersburg Glass Work Manufacturing Company (Санкт-Петербургское стекольно-промышленное акціонерное общество) existed between 1911 and 1918, but as St. Petersburg was renamed Petrograd in 1914, it means that these can be dated from 1911-1914, making them 100 years old.