I hate to tell you, but very little. You can purchase them from a dealer or on eBay for about $2 per cover or even less. They have almost no real gold, such a thin layer that it would take thousands of them to get a measurable amount.
This company produces a variety of products. Their first-day covers are real enough. I think they make gold or gold-plated replicas of certain stamps, which of course, are not real postage stamps. They offer some stamp and coin combinations that contain real US stamps and coins. I think they all sell at a discount of the secondary market.
Sir Rowland Hill invented the first postal service
the first postal system was used by mesopotamia
Yes
900 BC The very first postal service - for government in china
St. Alphonsamma is the first woman from Kerala to be pictured on the Indian postal stamp.
900 BC The very first postal service - for government use in China.
The first postal service, which was used only by government, was in China. 900 BC
William Penn established the very first postal office in Pennslyvania
Ernie
75001 is the postal code for the first district of Paris, in the centre of the capital.
The first postal service between Edinburgh and London was thought to be about the 50s around about the50s anway