This particular attestation with the Royal Artillery dates to November 1908, although the form itself had been in circulation for a good deal longer.
The code at the top of the form shows that a print run of 40,000 of these forms was issued in April 1907 and that it was the second version of this form. I will try and dig out the version before this although the changes are probably minor.
H W V stands for Hazel Watson & Viney Ltd, the printers of this and many other British Army attestation papers . I have no idea what [No.13] or 8 58 17 refer to, does anybody else?
All document images reproduced on this post are Crown Copyright, The National Archives. Service and Pension records can be searched and downloaded from Ancestry and Findmypast. Both companies offer FREE 14-day trials.