This is a subject dear to my heart. I have been using and collecting side by side doubles for more than 20 years and I buy sell and trade constantly to try to improve the quality of my modest collection. I use my guns - all of them. I have no safe queens. When I shot registered trap for years I used a series of dedicated trap over/under doubles and singles, going through 7000-8000 rounds a year but other than waterfowl all my hunting has been with my side by sides. For waterfowl I have used a Browning Gold Camo 3 1/2" gun for years and that's all it's used for. What I see in this field in the last 20-25 years.......
20-25 years ago, before the internet ( yes, no google, no on line businesses ) prices in general for doubles were very low. New side by side sales had plummeted and most makers were moving away from them. Lots of quality older guns in some areas ( as well as lots of old clapped out Belgian clunkers) but mostly they had been put aside for modern repeaters and few people appreciated or wanted the old girls. Enter Double Gun Journal, Shooting Sportsman, articles and books by respected authors all praising the qualities of these fine guns. Then Bam! Internet! Guns International!Guns America! Dozens and dozens of businesses, mostly in the US springing up, buying quality doubles in Britain and Europe and Canada and advertising them with mouth watering pictures at affordable ( sometimes) prices. Demand went up, availability of fresh guns dried up, prices went up. A lot of fine guns came on the market suddenly during the financial meltdown of 2008-2009 and prices nosedived in the US. In Canada prices lagged going up and really didn't sag much in 08-09 either, but at that time our dollar was par or higher and some nice pieces migrated north of the border. Since then the American economy has recovered, our dollar has shrunk miserably and high quality, high condition doubles are at their highest prices yet as the supply is drying up. I can give numerous examples of specific guns that I seriously researched and priced 8,9,10 years ago that are showing up now at double the price. And they're selling. Auction prices mostly show estimates, only the sold prices show the true value of any gun.
In Canada I see prices on these guns pretty flat in most areas for the last ten years. Those that were well priced have sold, those that were overpriced are still for sale, still overpriced, those in poor to average condition or needing expensive work don't sell. An excellent example is Ellwood Epps who five years ago had quite a few quality doubles for sale. The best ones are mostly gone now and not replaced, they were cherry picked and I would bet that a lot of them went south of the border. Similarly, there are Proxy buyers for American clients at all our big gun shows now with lots of $1.30 dollars trolling for the best guns. These guns are getting scarcer on our market every year and when they show up they are gone in a flash. Our prices for the better guns will go up when there isn't enough around any more to satisfy demand. Of course quantities, demand and prices vary around the country but the internet sites of some businesses and of course CGN tend to have a levelling effect. Bottom line, I believe the best time to buy that special gun is now, they aren't going to get cheaper.