Here are some sample British army service numbers and corresponding joining dates for the 19th Londons:
44 joined on 6th April 1908
855 joined on 12th May 1909
1092 joined on 1st July 1910
1143 joined on 9th February 1911
1327 joined on 1st January 1912
1585 joined on 10th March 1913
1920 joined on 22nd April 1914
2106 joined on 4th August 1914
2342 joined on 2nd September 1914
3283 joined on 9th November 1914
3332 joined on 2nd December 1914
3393 joined on 7th January 1915
3541 joined on 20th February 1915
3571 joined on 19th March 1915
3626 joined on 4th April 1915
4230 joined on 8th May 1915
4699 joined on 2nd June 1915
4916 joined on 28th July 1915
4934 joined on 5th August 1915
4964 joined on 15th September 1915
5010 joined on 18th October 1915
5061 joined on 13th November 1915
5132 joined on 25th January 1916
5224 joined on 29th February 1916
5341 joined on 2nd March 1916
5743 joined on 7th April 1916
6421 joined on 9th July 1916
7066 joined on 7th August 1916
7365 joined on 5th September 1916
7435 joined on 28th October 1916
7437 joined on 2nd November 1916
7576 joined on 4th January 1917
When the Territorial Force renumbered in 1917, the 19th Londons did so within the range 610001 to 630000. Also see my post on six digit number anomalies in the 19th London Regiment.
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Read my other posts on numbering in the London Regiment battalions:
City of London Battalions
1st (City of London) Battalion (Royal Fusiliers)
2nd (City of London) Battalion (Royal Fusiliers)
3rd (City of London) Battalion (Royal Fusiliers)
4th (City of London) Battalion (Royal Fusiliers)
5th (City of London) Battalion (Rifle Brigade)
6th (City of London) Battalion (Rifles)
7th (City of London) Battalion
8th (City of London) Battalion (Post Office Rifles)
County of London Battalions
9th (County of London) Battalion (Queen Victoria's Rifles)
10th County of London) Battalion (Hackney) [Originally Paddington Rifles]
11th (County of London) Battalion (Finsbury Rifles)
12th (County of London) Battalion (The Rangers)
13th (County of London) Battalion (Kensington)
14th (County of London) Battalion (London Scottish)
15th (County of London) Battalion (Prince of Wales's Own Civil Service Rifles)
16th (County of London) Battalion (Queen's Westminster Rifles)
17th (County of London) Battalion (Poplar & Stepney Rifles)
18th (County of London) Battalion (London Irish Rifles)
20th (County of London) Battalion (Blackheath & Woolwich)
21st (County of London) Battalion (First Surrey Rifles)
22nd (County of London) Battalion (The Queen's)
23rd (County of London) Battalion
24th (County of London) Battalion (The Queen's)
25th (County of London) Cyclist Battalion
28th (County of London) Battalion (Artists Rifles)
