Locks were produced in five different Workshops between 1818 and 1936 when Chubb ceased applying serial numbers. Here are the details and approx. range of serial numbers:
1818 - 1836 Temple Street, Wolverhampton #0001 - 7000
1836 - 1838 St. James Square, Wolverhampton #7001 - 19800
1838 - 1882 Horseley Fields, Wolverhampton #19801 - 899500
1882 - 1898 Glengall Road, London #899501 - 1375300
1898 - 1936 Railway Street, Wolverhampton #1375301 - 1889615
For more infomation please visit http://www.chubbarchive.co.uk