Postal cover.

Typed mailing envelope from Vienna with a sender handstamp for Reichert (Wien) addressed to the Optical Society of America, c/o George Banta Publishing Co., Menasha, Wisconsin. Red Vienna circular cancellation clearly dated 31.VII.46 (31 July 1946) with additional purple circular cachet and boxed meter impression. Brown tape remnant at flap; no visible handwritten message on the address side

Notes for Cover Collectors:
• High-resolution scans of front and back are provided; use zoom to inspect postmarks, cachet details, and backstamps.
• No third-party grading; condition is shown in the images.

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