Boy do I remember CCR--what a interesting LSD trip that song was=-almost in league with Bob Dylan's Highway 61 revisited. I would trust Brownell's to tell the truth, if they state their products are all USA made, that works for me. I think I will order their Manson gauge soon- besides the 16 Parker O frame I also acquirred a 12 Smith Grade 4 with Chain Damascus barrels--As it is common for those barrels to develop pits from black powder and older primers of that era- honing them out can indeed reduce wall thickness. Miking the walls of each tube and muzzle and breech is a start, but not a guarantee.
I'm not a big fan of the Brit rock groups, but believe either Pink Floyd or Led Zepplin did a song with the "rear view mirror" tag line inserted-all good, as I always have the boom box on when in the gunroom/workshop in the basement furnace room area-Bob Seger, Bob Dylan, Steve Miller and others from the past work for me!