Ancient Domains of Mystery (version 3.3.3, release 101)
64-bit Linux build

To reproduce:
# Equip an unidentified missile in the missile slot
# Check to-hit bonus using Ctrl+W (Display weapon skills) and M (Display missile statistics)

Observed behavior:
# Display weapon skills: E.g. "Damage caused with your missile weapons: Ammunition: 7, base range: 4, +8 bonus to hit, 1d6+4 damage"
# Display missile statistics: "Try to identify the <missile name> first."

Expected behavior:
Unidentified missiles should be handled in the same way in both screens. Probably 'Display weapon skills' should not leak additional information about unidentified missiles?

It might be that this also happens for unidentified melee weapons and missile weapons, I have not tried those.