I am interested in purchasing two firearms for my two daughters (one is 5 and one is 15 months). These will not be shooters, but investments with the goal of having appreciated in value by the time they turn 18.

I was originally looking for an older smith or colt revolver in mint condition but am having a hard time finding a mint pistol for under $1000 and I feel these are in a bubble right now or have close to maxed out on value. I then noticed the new 640 machine engraved with wood presentation box. This gun does not have the lock, which I could see 20 years from now as a rarity for guns from this era possibly adding to the value.

At under $800 I envision this firearm at least bringing its original purchase price if not $1200-$1500 in new in box condition 20 years down the road. Is my reasoning right on this or am I missing something?