1951 American Chemical Society #1002

This is a First Day of Issue envelope commemorating the 75th anniversary of the American Chemical Society (ACS), featuring a U.S. postage stamp issued in 1951. The envelope is a collectible item for philatelists and those interested in the history of science, celebrating the ACS's contributions to chemistry and scientific advancement since its founding in 1876.

**Product Description:**

- **Title:** 75th Anniversary of the American Chemical Society First Day of Issue Envelope
- **Issue Date:** September 4, 1951
- **Location of Issue:** New York, New York (postmarked with the date and time: 9:00 AM, Sep 4, 1951)
- **Stamp Included:** 
  - A single 3-cent U.S. postage stamp titled "American Chemical Society Diamond Jubilee 1876-1951."
  - The stamp features a design with a diamond shape in the center, symbolizing the "Diamond Jubilee," along with chemical apparatus (a flask and a burner) and the ACS logo. The stamp is in a reddish-brown color, with the text "United States Postage 3¢" printed on it.
- **Cachet (Design on Envelope):**
  - The left side of the envelope features a blue and brown illustration of a chemist in a lab coat holding a flask, with a background that includes symbols of scientific progress such as a factory, a microscope, and an atomic structure, representing the impact of chemistry on industry and innovation.
  - The text "75TH ANNIVERSARY" is prominently displayed at the top, with "AMERICAN CHEMICAL SOCIETY" below the illustration, marking the occasion.
  - Small stars and the years "1876-1951" are included in the design, emphasizing the anniversary timeline.
  - The cachet is credited to "Cachet Craft / Ken Boll," a known producer of philatelic envelopes, as noted in the bottom left corner.
- **Postmark:** 
  - A circular postmark reads "New York, N.Y., Sep 4, 9:00 AM, 1951," marking the official first day of issue for this stamp.
- **Additional Markings:** 
  - The text "FIRST DAY OF ISSUE" is printed to the right of the stamp, reinforcing the envelope's significance as a philatelic item.
  - The envelope is addressed in handwritten text to "W. E. Horn, Box 77, Annville, PA," indicating it was mailed as part of the commemorative event.
- **Condition:** The envelope appears to be in good condition, typical of a well-preserved collectible from the early 1950s, with some minor signs of aging such as slight discoloration around the edges (based on the image provided).

This First Day of Issue envelope is a piece of postal and scientific history, celebrating the 75th anniversary of the American Chemical Society, an organization pivotal to the advancement of chemistry in the United States. It serves as a meaningful addition to any stamp collection, science memorabilia, or a historical keepsake for those interested in the history of chemistry and scientific organizations.