Truly!
But...a few words anyway.

I was thinking that surely such a testimonial would have been included in Winchester's 1875 Catalog, which contained 18 pages of testimonials to the '73 (plus two pages to the '66 and six pages to the '60). And sure enough, it is, although they did not include the targets nor the last paragraph about the targets, nor the serial number. Although, to be fair, mine is a reproduction and maybe Hutton's targets were in original catalogs, or it could have been in some other advertisement. Bryan, do you know the source? In those 26 total pages, there is only a single testimonial with a target. Interestingly, the 1873 catalog (which features the '66 since the '73 wasn't in production when printed) is chock full of targets and factory testing.