I think you are confusing the dates. There were no stamps prior to 1840, so it could not be from the early 19th Century. It would be worth the value of the gold, which will be minimal as it is a very light plating.
The first adhesive postage stamp, commonly referred to as the Penny Black, issued in the United Kindom in 1840, was the result of the effort to bring reform and convenience to the early 19th century postal system in the UK which was in disarray and rife with corruption at the time.
The phrase "stamp and go" refers to a quick and hasty departure. It suggests that one leaves in a hurry, possibly without much preparation or thought. It can also mean to quickly complete a task and move on to the next one without delay.
Gerty Cori's stamp will have the error.
Stamp Act Congress
It costs 25 cents or $4.75 depending on what stamp it is. Hope this was helpful
Monroe
In the early days, the receiver of a letter had to pay the delivery charge. That was changed with the postage stamp, which indicated that the postage had already been paid.
Ye., The fact is that The Jews were discriminated against throughout Europe for hundreds of years. and still are to this very day. Discrimination can be legislated against however it is difficult to stamp out a culture that is more then a thousand years old.
There were many important events in the 18th century. Some of the events included the Boston Massacre, The Stamp Act was passed, the Revolutionary War took places, and America was formed.
Yes, they can be. While typically a used stamp has less value than a mint stamp, they are valued on the concept of supply and demand. A high value stamp is typically going to be very rare and high priced for the time frame it was used in. Early versions are also going to be more difficult to obtain than others.
Queen Victoria was on all of the stamps from Great Britain. George Washington was not a monarch, he was a US President. And Benjamin Franklin was on a US stamp very early on.
There are a variety of auction houses and stamp dealers. Check your local yellow pages for dealers in your area. I would recommend obtaining a copy of some of the philatelic journals, Stamp Weekly or Lynn's Stamp News. There will be many ads offering to appraise collections. The American Philatelic Association can provide names and addresses of dealers also.