I can't help with plating the stamp, but I found the history of the addressee noted on the cover to be somewhat interesting, which appears to be before her marriage to Calvin T. Wheeler in 1867:
Quote:
CALVIN T. WHEELER, the fourteenth vice-president of the Chicago Board of Trade, and president of the Continental National Bank, has for the past thirty-five years been conspicuous in the financial and commercial history of this city. He is a native of the State of New York, and was there reared and educated. In 1851, he made his first advent into this city and formed a partnership with T. J. S. Flint, under the firm name of Flint & Wheeler, and commenced a general commission and grain receiving business, He then became a member of the Board of Trade and was identified with the same for over a quarter of a century. During his connection with Flint & Wheeler, the firm was among the largest receivers in the city. Their first elevator had a capacity of 160,000 bushels and, in 1856, they completed Rock Island Elevator "A," which had a capacity of seven hundred and fifty thousand bushels. In 1861, Mr. Wheeler withdrew from that firm, and with others went into the private banking business. The name of the firm was Chapin, Wheeler & Co. They were succeeded by William F. Coolbaugh & Co., who, in 1865, organized the Union National Bank of Chicago. Mr. Wheeler became vice-president and director of the same, occupying the first mentioned official position until 1873, when he engaged in other business until 1875; then went back into the Union National Bank as vice-president, and remained until the death of Mr. Coolbaugh, the president, on November 14, 1877.
The board of directors of the Union National Bank then made Mr. Wheeler president of the bank, and he occupied the chair until the latter part of 1882, when he withdrew from the Union National and organized the Continental National Bank. Of this institution he is president, director and a heavy stockholder. Mr. Wheeler, during his connection with the Board of Trade, was one of its most active and prominent members, occupying positions upon various important committees, nearly all the time, during the years 1858 to 1868, inclusive. In April, 1862, he was elected to the presidency of the Board of Trade for the term of one year and, in 1863, was on the building committee which submitted a report that finally ended in the erection of the Chamber of Commerce built before the great fire. During his career as a banker Mr. Wheeler has become recognized as one of the most able and substantial bankers in the city, and he has now surrounded himself in his present business with men who are representatives of all that is progressive and conservative. Mr. Wheeler was married to Miss Kate L. Hoyt, of Michigan, in 1867, but her death occurred in this city on May, 1883, leaving an only daughter, Kate. Mr. Wheeler is a member of the Union League Club, and resides near Lincoln Park.