Yes, you most certainly can! You will have to determine the face value of the older stamps. As long as the combination adds up to or exceeds the necessary value, they can be combined.
Depends on the stamps one have. The older, the reare have philanthropic and antique values
Can I use food stamps
If they are the non-denominated US stamps, there is an identifier on the USPS web site. For collector values, check an online catalog, such as Mystic Stamps.
can I use my food stamps in AL
No, you have to use stamps from the country of origin of the mail. In this case you will have to use Italian postage stamps.
You could use another magnet with marked poles to determine the poles of the unmarked magnet. By observing how the unmarked magnet interacts with the marked magnet, you can identify the north and south poles of the unmarked magnet based on attraction and repulsion.
England as the first to use postage stamps, starting in 1840.
you don't - its unmarked
No you cannot use US stamps. Items mailed must have the stamps of the country of origin on them. Most shops will be able to provide you with the appropriate stamps to use to mail with their cards, or visit their post office!
No. When mailing items you use the stamps of the country of origin.
There are several different unmarked flag stamps. You need to look at this site http://pe.usps.com/text/qsg300/Q604a.htm and find the picture of the actual stamp you are interested in.
They are still valid for use as postage as long as they add up to the proper postage. If you check USPS regulations Postage due, special delivery and certified mail stamps are NOT valid as payment for postage.