72cheyenne said:Found this little snippet...
Govancroft Potteries, (1911-1982),
Glasgow, Scotland, England, occurs on 1 bottle,
Manufactured beer bottles. The firm is listed as having been formed in 1911 or 1912. They manufactured a wide range of stoneware, but jam jars and whiskey jugs were a specialty. In later years, decorative wares were manufactured. The works were last listed at the 1855 London Road address in 1982. The impression is near the base of the bottle.
Given the shape, I would say early 1910s.
Here's the link http://www.sodasandbeers.com/SABBottleManufBeerSoda.htm About 1/3 way down.