Letter of marque

Definition and stakes

Nathan Clifford Manufacturing Company v. Trainer…

Brands or stamps called trade-marks, says Waite, may consist of a name, figure, letter, form, or device adopted and used by a manufacturer or merchant in order to designate the goods that he manufactures or sells, and to distinguish them from those manufactured or sold by another, to the end that they may be known in the market as his, and thus enable him to secure such profits as result from a reputation for superior skill, industry, or enterprise.
Source: Wikisource

Anonymous Business Correspondence, Vol. 1…

Original sales letters are of two kinds: those that endeavor to perform the complete operation and secure the order and those that are intended merely as the first of a follow-up series or campaign. Which to use will depend upon the nature and cost of your proposition. A simple, low-priced article may be sold with a single letter—the margin of profit may not warrant more than that. On an expensive, complicated article you cannot hope to do more in the initial letter than win your prospect's interest, or possibly start him toward the dealer who sells your goods.
Source: Gutenberg

Mary Owens Crowther How to Write Letters (Formerly The Book of Letters…

Do not write a sales letter that gives the same impression as a strident, raucous-voiced salesman. If the idea is to attract attention by shouting louder than all the rest, it might be well to remember that the limit of screeching and of words that hit one in the eye has probably been reached. The tack to take, even from a result-producing standpoint and aside from the question of good taste, is to have the tone of the letter quiet but forceful—the firm, even tone of a voice heard through a yelling mob.
Source: Gutenberg

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