Another Little Quiz & Winner Gets A Prize

There are 4 stamps on this cover. There is something wrong with one of these 4 stamps. Can you identify the stamp and explain what is wrong with it.
The PRIZE? The winner will receive in the mail the 3 early Vietnam Ho Chi-ming stamps (pictured below). Yes, they are genuine! They look horrible! Vietnam is going to be the next "China". Ask me if you don't understand why?

my guess - the overprint purports to celebrate 150 year anniversary of the constitution. Guatemala did not become independent until 1821.

RA7 is missing 1937-1939. Nice cover.

Ponso1 - the overprint is celebrating the 150th anniversary of the United States constitution.

In addition, my Scott's only has a price for the Postal Tax stamp for an unused copy. A used version must be much more rare. Again, great find.

I think Partime has the right answer on this one, but still anxious to find out the answer anyway and because of my newbie status I need a further explanation of what you mean by Vietnam being the next China?

China has had a huge resurgence in prices over the last few years, for various reasons. In my opinion, most likely due to the noveaux riche (spelling?) and their interest in their history. Vietnam could well be next on the list of countries becoming more interested in their past.

By the way, the only other thing wrong with fotofila's cover is that he owns it, and not me! Is that the answer to a bonus question?

Ra7a with omitted dates 1937-1939
RA7 has the correct dates.

This was a very easy quiz. Not too many countries, however, issued postal tax stamps. Guatemala did it to impose a 1 centavo postal tax per letter as a method to generate money for a new post office building that was destroyed in 1917. RA7 was issued, in conjunction with a beautiful souvenir sheet, in commemoration of the 150 anniversary of the US constitution. At the later printing stage, probably near the end, the types of the bottom line of dates became loose and eventually fell out of the locked form in two stamps close to the BR of the sheet. This was a continuous process and many stamps show partial loss of the dates, as shown by the vertical pair below. Stamps with complete missing dates are quite rare, as state in Guatemala Handbook Vol. 2, "The postal tax stamp with the last line of the overprint missing is one of the greatest rarities of Guatemala philately. Not more than eight or ten ever discovered." The Scott valuation is ridiculous. This cover is unique and it is also the only known used copy of this error exist. The cover, even though was sent to a stamp publication company, was not philatelically prepared. The sender did not realize that he placed a rare error on the mail and the recipient did not know that he had a cover with the error, judging from the randomly franked stamps and the way the cover was opened.
The block containing two errors below is also unique.

OK, Mr. Partime, please email me your mailing address and I will mail you your prize. Also I will include Scott Check-list on New Zealand Stamps, same on Australia Stamps and same on Israel stamps, if you can use them. All three are brand-new booklets.

Partime is correct on predicting Vietnam is going to be the next "China" in philately. Vietnam is becoming economically strong in the world marketplace. When a country becomes wealthy; her people become wealthy. So, what do they do when they have money to spend? They buy collectibles and philately is a form of investment and satisfaction to these people. The Chinese and the Vietnamese families push their children to out-perform in schools. They want their kids to get the best education available. Why? They simply want their children to get the most comfortable life in the future. I know it well, because I am a Chinese-American.
(I hope that I did not offend any member. Accept my sincere apologies if I did.)

Fotofila .. that was fun. We have to see if we can do more of these quizzes / contests. As far as the next China, I do imagine Vietnam and perhaps India to some extent. We'll see. Information sent in separate email.

In the future, consider using the "Contests, Quizzes, & Giveaways" Forum
https://goscf.com/f/33

Many thanks to Fotofila for the package. The picture of the Vietnam stamps doesn't do them justice ... they are about the roughest cut stamps I have ever seen. Even the paper is described as a "thin, rough, brown paper."

The stamp checklists will come in very handy also. Looking forward to seeing more of your collection and the various stories behind them.

As an aside, the Gossip Printery was the major printer of philatelic literature of all kinds for many years, the Weekly Philatelic Gossip was only the tip of the iceberg.