Ive helped out a friend purchase 2 ASEL 20s. I found them, vetted em, and even did the haggling. They are spectacular guns. Light they are....finished extremely well (inside & out) balanced perfectly and are about the trimmest o/u guns Ive ever handled. The engraving, especially the full coverage rose bouquet is stunning. My favorite version is the straight grip, solid rib double trigger versions....uber sexy. 10 years ago, you could find a pretty decent model/example sub gauge in the mid 3 to 4K range.....not anymore. Prices have gone bananas on these guns here in the States.
What you get for that money is a damn near perfectly machined action, lots of hours of hand finishing, bohler-antinit barrels, pretty decent wood and one hell of a shotgun to kill birds with. Youd be extremely hard pressed to find a modern gun that checks all those boxes in todays world without going into the $15 to 20k range.