Here are some army service numbers and corresponding joining dates for the 17th Londons:
367 joined on 3rd June 1908
864 joined on 13th July 1909
1076 joined on 1st September 1910
1100 joined on 9th February 1911
1320 joined on 20th June 1912
1593 joined on 15th May 1913
1885 joined on 7th July 1914
2012 joined on 6th August 1914
2323 joined on 1st September 1914
3283 joined on 17th November 1914
3314 joined on 15th December 1914
3326 joined on 8th January 1915
3445 joined on 2nd February 1915
3633 joined on 13th March 1915
3823 joined on 7th April 1915
4198 joined on 4th May 1915
5037 joined on 14th August 1915
5149 joined on 4th October 1915
5411 joined on 20th February 1916
5451 joined on 1st March 1916
5648 joined on 8th April 1916
6167 joined on 21st June 1916
6490 joined on 6th July 1916
6602 joined on 4th August 1916
8137 joined on 1st September 1916
8451 joined on 5th October 1916
8693 joined on 23rd November 1916
8695 joined on 5th December 1916
8729 joined on 2nd January 1917
Later in January 1917, the 17th London Regiment was numbering with the new six figure Territorial Force numbers. It did so within the range 570001 - 590000.
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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)
18th (County of London) Battalion (London Irish Rifles)
19th (County of London) Battalion (St Pancras)
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)
