Multiple Modern Post Stamps On Envelope?

I tried to search a forum for this topic, but I did not find what I was looking for.
I open this topic in the hope that you will join discussions and show your envelopes with multiple modern stamps.
On some envelopes, there are postage stamps that have a higher value if used (in comparison if not used). At least I see in some catalogs like Scot or Michael.

I'm interested in the following:

1. What is the essence of the beauty of these envelopes?
2. What's more important, a postal stamp or a postmark with a date? Or both?
3. Which envelope is more appreciated, the one who traveled or the one who did not?
4. I've read somewhere on the Internet (I do not remember where), that some philatelists canceled (void) postage stamp in the post office service. Why?

In this topic, I will present my envelopes with multiple postal stamps.
To start here are some.

Traveled on relation US to Croatia

No traveled

Traveled on relation Croatia to Canada

Traveled on relation Canada to Croatia

Traveled inside Croatia

Traveled on relation Croatia to US

Traveled inside Croatia


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1. What is the essence of the beauty of these envelopes?
Many stamp collectors enjoy making attractive covers to collect for several reasons. Sometimes they have friends who collect stamps and they want to use attractive stamps on the mail they send to them. Sometimes they want to make an attractive envelope to collect for themselves. Sometimes they want to save money by using older stamps. For example, in the US you can buy older stamps for as little as 60 percent of the face value of the stamps since they are not easy to use on mail when the postage rates have changed and you need to find stamps that make up the new cost of postage. Very few US postage stamps from the past 75 years have any value beyond their the value that is printed on them so using them for postage is not a loss to the owner.

2. What's more important, a postal stamp or a postmark with a date? Or both?
It depends on several factors, but with modern stamps - from the past 75 years or so - there is often greater value for stamps that are still on their original envelopes than ones that have been removed. Ones on their original envelopes can be first day covers, first flight covers, special commemorative event covers or just ordinary covers and all of these are called "postal history'. For many collectors the history of a stamp being used and the story it tells when it is still on its original envelope is additional value over just the value of the used stamp.


3. Which envelope is more appreciated, the one who traveled or the one who did not?
Again, it depends on the preference of the collector. In general, a person who is collecting a first day of use cover or a special commemoration cover they want a cover in perfect condition and one that has gone through the mail is usually not in perfect condition so they prefer ones that have not gone through the mail. If a person is collecting first flight covers or ordinary mail covers they insist on it having gone through the mail since they are more interested in the history of that cover and the postal service.

4. I've read somewhere on the Internet (I do not remember where), that some philatelists canceled (void) postage stamp in the post office service. Why?
I am not sure what you are asking but I think you might be referring to the practice where a collector or dealer takes covers to a post office and the collector or dealer is given the post office's cancellation device and the collector or dealer does the cancelling with that device. This is done only when the post office clerk is friendly and willing to let them do it, and some collectors and many dealers ask to do this because they want the cancellation to be fully inked and very clear and not covering parts of the cover that they do not want the cancellation to be placed. They want their covers to be perfect and as attractive as possible. Many post office clerks are only interested in cancelling the stamps and may not care as much about making everything perfect.

Hi @Kimo
I am amazed. Fantastic explanation. How can I thank you?
Simply
Thank you very much for this explanation!
Thank you for your participation in the topic.
Best regards

Here are some more envelopes with multiple stamps.

I am happy to help. Modern envelopes such as the ones you are showing have little monetary value, but they can be of high personal value to a person who enjoys collecting them. As you collect more of them you will be able to begin to see interesting features about the ones that have traveled through the post such as postage rates, the amount of time it takes for one to make the journey, special services such as registration, special markings and labels being used, and so on. For those that are not put through the mails you can enjoy learning about the special events that they commemorate. And you can begin using your creativity to make some of your own. The hobby of collecting gives a person the opportunity to learn and have fun for a very minimal cost.

Hi @Kimo
Thank you for this education.
Best regards

Thank you for keeping these covers intact. They will be the postal history of this era in future times. Enjoy them as they are.

Hi @hoosierboy
Thanks for the advice. I love multiple stamps on the envelope.
Best regards

There's more envelope with multiple postal stamps.
1st is postcard (Croatian stamps with US stamps)

Another