Parker didn't produce a .410 until 1924 and they were not available to the public as a catalog item until 1927....approximately 460 + or - were produced in all grades with the majority being V grades. (Ronald S. Gabriel; American & British .410's)....the only rarer Parker gauge is the 10 gauge 3 1/2" magnum with steel barrels - around 93 were produced. Winchester produced fewer model 21's in .410 than Parker did.
As far as the .410 being a "kiddie gauge ill suited to putting meat on the table" - that is rank and utter bull shizzle.
