To Miss Anna:
Here are some specimens of Black Cap for Mr. Alan Prescott, scanned from a book entitled Handbook of Early Advertising Art: Typographical Volume by Clarence P. Hornung which is a Dover Publication first published in 1947, second publication in 1953, and third publication in 1956, the third publication is the source I scanned the specimens of Black Cap from.
William E. Loy writes that Black Cap was designed and cut by Charles H. Beeler Jr. for MacKellar, Smiths & Jordan.¹ The earliest-known commercial specimen was advertised in the January 1891 edition of The Inland Printer, so he probably created it in 1890.
The MSJ ad and catalog of 1892 do not claim a design patent, and none has been found. After the merger in 1892, ATF showed it in 1897 and 1898 with an apparently erroneous notice. Unfortunately, lack of a full alpha-numeric patent exhibit means that certain glyphs may not be available today.
Black Cap has been revived as Blackguard PDS Roman. Flickr specimen follows. Thanks once again to Robert and Anna for helpful materials. The J and X appear to be unavailable, so I have created plausible glyphs with an alternate X as well as a question mark and bang: