For large frame revolvers the question might better be phrased as when was it made, rather than who built it.
The finest workmanship is to be found in target revolvers produced in the decade prior to WWI: Triple Locks and New Service Targets all were produced to very high standards. Webley WG's too, starting with the '94 model, are superb revolvers.
New Service Targets, Shooting Masters, 38/44 outdoorsman and 357 Magnums made during the depression years were indeed very carefully fit up, but the time to produce the magnificant external finish seen prior to WWI was not taken.
Today, only Korth makes a revolver approaching the standard of workmanship seen in these old revolvers.
Bob