Claude
This is a plate block of four 3-cent stamps commemorating the 125th anniversary of the Baltimore & Ohio Railroad, chartered February 28, 1827. The stamps are printed in blue and depict a juxtaposition of an early horse-drawn rail car alongside a modern diesel locomotive, with the text of a charter document in the background. The plate number 24605 is visible on the right selvage margin. The block appears to be in mint/unused condition with full perforations and original gum.
Mistral
This First Day Cover features a plate block of four 3-cent stamps commemorating the 125th anniversary of the Baltimore & Ohio Railroad's charter. The stamps, printed in blue, depict a horse-drawn rail car and a modern diesel locomotive with charter document text in the background. The plate number '24605' is visible on the right selvage margin. The envelope has no cachet artwork or visible postmark, and the condition appears to be mint with original gum.
(The automatic summaries sometimes misidentify the postmark as part of the cachet artwork.)
