I am someone who has tried to take advantage of the decline in prices over the last few years being lucky enough to have acquired a handful of nice double rifles by known British makers for prices that I would not have thought possible several years ago. I have stuck to prewar British guns made by major makers (Holland & Holland, Rigby, Westley Richards, Rodda, etc). I really appreciate the history and craftsmanship from the "golden age" of big game hunting and I like to use them.
Now, I often wonder if they are a good investment even buying at the recent depressed prices. I am not sure on that as time will tell, but I am happy to own them so far. I will say, I feel like I have seen somewhat of a rebound in auction prices in the past few months, at least in the US. Likely a symptom of inflation pushing people to want to own "real" items of value rather than keeping in cash or equivalents.