On On the Mall: In which one may see how boring I am

Apparent number of sets owned: twelve

Number of envelopes: three (labeled "On the Mall," "On the Mall," and "St. Louis Blues")

Prices marked:
$1.00, corrected by rubber stamp to $1.25 (2 sets)
$1.25
$1.25, corrected by rubber stamp to $1.50 (2 sets)
$2.00, with correction sticker residue (2 sets)
$2.00, corrected by sticker to $2.50 (5 sets)

Last known price: $80.00

Unexpected ownership stamp: Regimental Band Detachment, 301st Ordnance Regiment

Parts of "Onward-Upward" filed in set: 2

Humorous phrase resulting from unfortunate line break in Goldman Band System advertisement on reverse: "odious exercises."