Webley 700's are very nice guns, good solid boxlocks with very good handling dynamics. While 12 ga versions are predominant out there the sub gauages demand a nice premium. 12's will bring between 1500.00 3000.00 depending on condition while 20's 3500.00 - 5500.00 once again depending on condition and details such as stock config, engraving and barrel length. The 28's even more of a premium because of their scarcity. All the 28's are 25 or 26 in. barrels which is too bad because finding a sweet swinging one with short barrels is problematic yet some do.
I would much rather own a Webley over a Parker Repro just because they are well made , will last and most have great handling qualities which cannot always be said for the repros.
On the other hand I would not plunk down 6500.00 with 25 in. barrels and a short stock.
The real Webley treasures out there are the 28 in barrled 20 gauges