Let me see if I am understanding you but, since I am a over 60 collector, can be more 'frank' without offense. Am I worried that I will outlive the value of my Buck knife collection. Answer: Not as long as the company is a going enterprise and there are things like the BCCI collectors club alive and well. As per example look at the value of some of the knives of companies that have disappeared or custom makers who have passed away. Some of those are off the charts in value. If you had two or three you might could get a new car. In you case you are concerned if you spend $700 on a 124 would you be able to get your money out of it. Well, right now a war surplus life boat knife worth $5 new, if re-bladed back in the days when Bucks were made in a shed are so expensive I can't afford to buy one. So I don't. You are splitting hairs on collecting and investing. Most collectors I rub shoulders with at events where we put out our collections for viewing are 90% 'collecting' and 10% hoping to have an investment. My little junk 300s are not an investment, if I were to find one of those Buck life boat knives I could afford I would get it. To have and to hold and to show, not to hope it makes me money in 15 years. I think in your case UK vs USA is your biggest concern. Over here we are still have a 'large" outdoorsmen population, those people appreciate fine knives say like they do fine shotguns. If you were thinking of your Bucks as an investment, I would believe you will have to sell them over on this side of the pond. Your side will continue to get more civilized and have less and less of a overall population interest in knives.
You aggressive collectors do not write me now, please, I will delete you, but eventually, multiple years from now I will take some time an enjoy selling off my collection slowly, maybe even helping out deserving young collectors with some harder to find models at fair prices. I know my wife will not care if I say this but I don't want her to dump them in one lump sale and get the shaft. I enjoyed collecting them, I intend to enjoy selling them.
I don't see the Buck family giving up their business and several of them are younger than me. So, no I don't expect to outlive the value of my collectable knives, say like the example given of stamp collecting. Knives are a 'everyman' item. Besides just watch the zombie movies, which I don't, you will need good knives in the advanced future....ha
My opinion....300Bucks