Possibly, Drongan Castle Colliery, Drongan, Ayrshirec. 1890s to 1905 The Shieldmains Collieries may also be a suitable candidate for this brick – GB This example is not in my possession . .
The location of the Drongan brick manufacturing site is unknown.
Below – 02/03/1901 – Kirkintilloch Gazette – Shieldmains Collieries, Coylton, near Ayr recently sunk several coal pits at Shieldmains on the Drongan Estate – ( possibly connected to Drongan bricks?)
26/05/1934 – The Scotsman – New Scottish Companies – 17906 – Drongan Brick Company Limited. Private company to carry on the business of manufacturers of and dealers in bricks, slates and pottery. Capital £2000 in £1 shares……
31/01/1939 – The Edinburgh Gazette – Companies Act 1939 – Notice is hereby given…….that on expiration of 3 months from the date hereof, the names of the under mentioned Companies will unless cause is shown to the contrary , be struck off the register and the companies will be dissolved – Drongan Brick Company Limited.