Regret selling or trading a LONG time ago a S&W 66 snub, a Model 19-1, and a Colt Python 6 inch nickel...what I could get for those now.
This is kinda funny. Most are talking about seller's remorse... wishing we had an old favorite back so that we could shoot it & enjoy it.
Your remorse doesn't sound like that at all. You wish you had it back... so you could sell it again for more money!
If that were the case, we'd have seller's remorse over anything and everything EVER sellable, if there's a market for it today. Imagine if your parents still owned the first house they bought, and what THEY could sell it for today. (well, for the most part!