Thanks for sharing the image of William Aitken's work.
I'm adding a resized image for those using smaller monitors.
William Aitken entered this mark with the Birmingham Assay Office in August 1904. His premises at this time were located at the Eagle Works, 78, Summer Row, Birmingham. His earlier premises were recorded at 37-38, Vyse Street, Birmingham.
William Aitken also used the services of the London, Sheffield, and Chester assay offices.http://www.925-1000.com/dlBirmingham6.html#M