Could be an attached memory or sentimental value, whatever.
Conventional worth be dammed.
Given to me it would either be the quilts my grandmother made, or the charts my grandfather followed along with during the moon landing.
Personal items would be the assorted thank you notes the elderly have given me from being in retirement industry. Want to make a collage of them one day.
I have a letter opener made by my great uncle for my grandfather.
What makes it interesting is that my great uncle worked as a mechanic for the RAF, keeping Spitfires flying during the Battle of Britain and the letter opener is made from discarded parts from Spitfires he worked on. Not sure what the blade was, some small strut or something, I suppose, and the handle is made of different-sized washers.