U.L.D. could be the initials of the owner. This is common practice in India, owners tend to label personal belongings with their name or initials. Indians love abbreviations!
U.L.D. also happens to be the Train Station code for Achalda, a Town in Auraiya district in the Indian state of Uttar Pradesh. I do not know of an armoury or fort in the town, but the nearby city of Etawah has significant military history where it was involved in the First War of Indian Independence in 1857.
It may just be a coincidence. Sorry I cannot be more definitive.
Pictured below is an Indian dagger I recently had possession of, with a marking of ALG (also Romanised), so presumably done during British rule. I believe it was from Aligarh district, also from the state of Uttar Pardesh - locally known as U.P (see what I mean about abbreviations)!
Kind Regards,
Runjeet
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