This rare life-ring was only in production from 1912 - 1914, very useful to know when i was determining which one of the four Sheldrakes this was originally onboard of.
For use with Smoke helmets. Fire fighters breathing equipment. Great item by the infamous makers Siebe Gorman & Co Ltd Submarine Engineers Cwmbran.
...but huge! I rescued these from guys who were intending to break them down into boards to make into furniture.