Hi Staples,
Yes it does look like "7/97" to everyone -including moi!
In the past I had a couple of 18pdr projectiles, with similar date stamping just above the driving band, hence I'm confident that it is a date stamp. (see below for a "7/1928" shrapnel projectile and fuse, incorrectly painted as a HE, but the "stenciling is over the stamping") and the sectionized 1940 HE 18 pdr & fuse (although this date format is "8-40", but positioned just above the driving band)
I'm forming the opinion that it has been incorrectly stamped:
1) Researching further, it appears that the British did not tender for the 18pdr design until at least 1902/1903 with the early version produced in 1904;
2) With a diameter of 83.36mm, it is definitely an 18 pdr, as the 15pdr, 13 pdr all had diameters of around the 76mm mark;
3) Perhaps at the time a "0" stamp was not available and the "9" was used in stead? As back then it would have been easily dated - for the same reasoning perhaps it was meant to be "7/17" i.e. either side of "9"??? (OK I know this is getting somewhat "far fetched!")
4) There was a "joker" in the factory!!! What's a date stamp back then when the Projectile was going to blow up anyway! (just to annoy me 100 years later!!!)
My head hurts!
Cheers
drew
BTW - THe 1940 18pdr HE was made by guess who? Has "BHP" stamped on the body, which I only just noticed with this "research exercise"!!!