Old US Stamps On Postcards

I have few old Post cards and they have stamps. I do not know anything about them. A#1090;y help would be appreciated. Thank you
No preformation on top or bottom.

2 post cards with green stamps. One has no perforation on the bottom.

Postcards were sent by the millions and billions in those days. The likelihood of any stamps being particularly rare is low. They are the common stamps of the era. Check out StampSmarter.org if you are interested in learning more about them.

My understanding is that the value of postcards is based mostly on the picture side of the card. The reverse side (with message, stamp, cancel, and address) may enhance the front side's value. The stamps on your examples appear to be common stamps and are not going to add to the value.

Just like covers, stamp , cancel and address are on the front.

I did not find a green stamp with no perforation on the bottom/ Some do not have on the sides, but only bottom?

Nothing unusual about it. There are no perfs at the edge of a sheet.

no perfs top and bottom or left and right are called coil stamps and were sold in rolls. no perfs on adjacent sides (ie left or right and bottom) are from booklets. no perfs on either left or right side only are sheet margin copies on some issues. see stampsmarter.com or the scott stamp cat. reference pages for more info.

Welcome.
Stampsmarter website has a large amount of information on yoru stamps, here is a good starting point https://www.stampsmarter.org/1847usa/1847Home.html
Don

If I see someone make a statement which I believe has the wrong terminology, I tend to look and see what the accepted terminology is. So, I Googled "which side of a postcard is the front?" and found myself at another philatelic forum where they polled that exact question (thus the reason it popped up on a Google search). The results of that poll were: 30% the address side, 45% the picture side, 18% thought us was more complicated than that, and 7% said 'whatever'. The forum went on to say that the front and back of a postal card is fairly universally accepted as the address/stamp/message side is the front - and this tends to be the basis for the front/back debate of a post card. Postal authorities almost universally say that the front is the side with the address and stamp - the position of the other stuff is irrelevant to their definition. Deltiologists, on the other hand almost universally define the front as the side with the picture of a PPC. They also seem to be the only group to have a definition that backs up their contention --- post cards are categorized as either Divided Back or Undivided Back --- the post card at the top of this forum is a 'divided back' post card. The respondents in that forum went on to say that philatelists tend to land in between the 'postal authority group' and the 'deltiology group'. Some passionately argued their point - both camps. It is easy to say that 'definition for a post card front/back' = 'definition of a postal card front/back', but although they are similar, 'post card' NOT= 'postal card'. The only universal in this debate appears to be that there is no universal agreement.

Based on that, you are entitled to your opinion as to which is right, and I mine.