Range Graduations for MkVI ammunition on British/Dominion WW1 scopes.....

[RobD]

That's a lovely sight. The stock disc: April 1914 issued at Rawalpindi to 1st Batallion, 5th Gurkha Rifles. Rack number 229.
From wikipedia I see:
"the 1st Battalion [5th Gurkha Rifles] saw extensive and hard service at Gallipoli in 1915 (where seven officers and 129 men were killed in the first few hours after the battalion landed).nDuring the withdrawal, a company of the 5th Gurkhas were among the last troops to leave."