It's something you would remember every time you looked at it. Kind of creepy to think about even holding a 'known' weapon like that, but as mentioned, some have unknown histories. That being said, lots of variables to consider in the who/what/when category.
I was looking up Earnest Hemmingway's suicide and what he had used, it was his prized English side by side pigeon shotgun. The gun was eventually dismantled, cut-up and buried in a field outside of Ketcham Idaho. Story goes that someone found it and re-built it!?

I heard of someone who collected assassination weapons, not the original but 'like' models. A specialized field of gun collecting.

I would pass, bad Juju.