Official commemorative Medallic First Day Cover issued by the International Society of Postmasters, celebrating the Centenary of the Museum of National History at Frederiksborg Castle in Denmark.​
This limited edition item contains a genuine Sterling Silver (925/000) proof medal, professionally mounted within the original First Day Cover alongside the matching 1.80 kr “Frederiksborg Museet 1878–1978” postage stamp, officially cancelled on March 16, 1978 in Copenhagen (København) with first day postmark.​
The silver medal shows a finely detailed view of Frederiksborg Castle, home of the Museum of National History, highlighting its ornate Renaissance architecture and lakeside setting.​
The reverse of the cover includes the original Certificate of Authenticity text, confirming the official nature of the issue, the sterling silver composition of the medal (approx. 34 g), and the First Day of Issue details.​

Details

• Country: Denmark

• Year of issue: 1978

• Event: Centenary of the Museum of National History, Frederiksborg Castle

• Metal: Sterling Silver (925/000)

• Finish: Proof

• Type: Medallic First Day Cover

• Issuer: International Society of Postmasters

• Stamp: Original 1.80 kr Frederiksborg Museet commemorative stamp with First Day cancellation

Condition
Very good vintage condition overall.
Minor age-related spots and light paper toning visible on the card, especially near the medal bezel, consistent with age and clearly shown in the photos.
The silver medal is in excellent condition with sharp architectural detail and bright proof surfaces.
A scarce and elegant collectible, ideal for silver collectors, FDC collectors, Danish history enthusiasts, or anyone who appreciates high-quality vintage commemorative silver issues.