There are four giant cantilever cranes left on the Clyde - the Finnieston, Barclay Curle, another one, and this one - the King George V in Greenock. The latter three were all made by Sir William Arrol & Co. Ltd. - this is a picture of the King George V crane from a 1927 Arrols catalogue:
And this is the crane now:
And this is the crane now: