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I would like to send mail to the US together with a SASE. How many 'Global Forever' stamps can I allocate on 1 self addressed envelope please? Can I put 2 stamps if the envelope weighs 2 ounces (just to be on the safe side) please?

Cheers,
Leon Camilleri

I did try to get an official answer over this from USPS but had no luck.

Each Global Forever stamp is worth $1.20.

If you use the postal calculator on the USPS website it will give you a price for your item.

Then use as many stamps as it takes to meet that price

I have myself used 3 when sending for a Playbill and my request has come back fine.

For a c5 envelope contains 3 photos iv always used one global stamp with no issues