OWD, There were/are several high end duck clubs in California that require/required the use of 20 ga. guns by their members.Our Parker friends are well aware of the heavy,long barreled guns that were used in that area in the early 1900's.Some with 3" chambers. I would assume that the decision of whether or not to have a safety was that of the buyer.

Better to keep your mouth shut and be thought stupid,than open it and confirm.