This is a pair of unaddressed First Day Covers (FDCs) from Grenada, celebrating the 75th Anniversary of the First Zeppelin Flight. Both covers feature premium "Z" Silk Cachets.

• Year of Issue: 1978.

• Country: Grenada.

• Cachet Producer: "Z" Silk Cachets.

• Cachet Design: Each cover features an embedded silk-style pictorial cachet depicting early zeppelins flying over maps and globes.

• First Day of Issue (FDOI) Cancel: Postmarked with a clear circular datestamp from the G.P.O. in Grenada, West Indies, dated 13 Feb 1978.

• Postage Included: One cover bears the $1 and 1/2c stamps, while the second cover bears the $3 and 2c stamps from the anniversary aviation issue. The 1/2c stamp includes a portrait of Ferdinand von Zeppelin.

These covers are a clean, practical addition for topical collectors focusing on aviation history, airships, zeppelins, or silk cachet designs.