The 1946 #939 3c US Mercant Marine - House of Farnam FDC is a collectible first day cover featuring a 3 cent stamp with a United States origin. The cancellation type indicates that it was used on the first day of issue, adding to its historical value. The FDC is certified as unc ertified, and its topic reflects the military and war themes that were common during this time period in the United States. Overall, this FDC is a unique and patriotic piece that showcases a significant moment in American history.