Erection date: 21/6/1886
This memorial stone was laid by HRH Albert Edward Prince of Wales on behalf of Her Majesty Queen Victoria, Monday June 21st 1886, in the 50th year of Her Majesty's long, happy and prosperous reign.
The Right Hon. John Staples Lord Mayor
David Evans Esq, Alderman, Thomas Clarke Esq, Alderman – Sheriffs
Edward Atkinson – Chairman of the Bridge House Estates Committee
Horace Jones Esq, PPRIBA – City Architect
John Wolfe Barry Esq, MICE – Engineer
Although it doesn't specifically say, this is the foundation stone for Tower Bridge.
Site: Victoria's Golden Jubilee - Tower Bridge (1 memorial)
E1, Riverside walk