Inert, British, No. 89 Mark I Long Range Artillery Fuze, complete with adapter.
Stamped markings on the Fuze include: "No.89 I R L" and "21"
The following is copied from the internet:
Initially developed in 1917 for BL 4.7in and BL 60pr field guns in anti-aircraft role, the time and percussion fuze N°89 was the longest range fuze that was used by the British army in WW1, with a maximum combustion time of 60 seconds, 15 seconds longer than the long range Fuze No. 88.
Designed to reach that long delay, the N°89 was another evolution of the Fuze No. 83, keeping the same graze percussion system with a centrifugal ball safety system and the eccentric time pellet system, but with 3 time combustion rings instead of 2 as in every other British T & P fuze. The lower disk was graduated from 0 to 22 time units as usual, but even set to '0', the two ring composition had to burn completely before the burst.
This fuze was dedicated to the shrapnel shells of the :
BL 4.7 in long range field guns (4.7 inches - 120 mm),
BL 60 pdr long range field guns (5 inches - 127 mm),
BL 6 in field guns (6 in - 152 mm),
BL 9,2 in guns on railway mounting (9.2 inches - 234 mm),
BL 12 in guns on railway mounting (12 inches - 305 mm),
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