By my own calculations, Army Form B.217 must originally date to between June 1883 and February 1884. The image above is the second iteration of this form and dates to February 1884 when a print-run of 5,000 was ordered.
The original intention was that this attestation form should be for Foot Guards, but over the years this was changed to serve the purpose of short service attestation for all those men enlisting for 3 years with the colours and 9 years with the reserve.
The image above shows the 34th version of Army Form B.217 which was printed in a run of 100,000 in May 1905. Note that in this case, the terms of service have been reversed so that Henry Bruty was signing up for nine years with the colours and three years on the reserve; far more practical than 3&9 for all concerned.