I saw a bit of utility in having initials on one item, having Swaine Adeney engrave my initials on the collar of my travel umbrella. Looking back I should have had them engrave ‘Stolen from Réginald-Jérôme de Mans’ instead.
Réginald-Jérôme de Mans in a post about monograms and engravings, suggesting what I think might be the most useful engraving of all.