An acquaintance has found the following markings on the side of his no 5's buttstock:

26 10 48
I H L
73
A SQN

Logically, I would think that:
Line 1 would be the date of issue in the unit,
Line 2 , the unit's abbreviation,
Line 3, the weapon's rack number
Line 4, the sub unit.

I haven't been able to find what unit I H L would be associated with. Any ideas?
The SQN has me puzzled. SAS? Cavalry?
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