Can I put a penny stamp on my already-printed metered letters? [more inside]
I have a large stamp collection that has postage stamps from around 1920 or so through the present (mostly 1920s through 1950s), mostly U.S. but some foreign as well. Most stamps came off mail and are in an album. Some have postmarks, some don't. I live in Boston and would like to take the collection in person to a dealer who won't rip me off, but I'm open to other alternatives too.
I am a lazy butt and hate going out of my way to mail things. USPS ClickNShip works perfectly for my needs, but now that I'm doing BookMooch I want to use a cheaper postage method, like media mail. What can I do? [more inside]
My wife wants to send stamps to a friend in the Philippines so the friend can write back easily. What type of stamps should she buy?
Are all US postage stamps now self-adhesive? [more inside]
I'm looking for an authoritative price guide for postage stamps, primarily US stamps from prior to 1960, similar to the Overstreet guides printed for comic books. There are a number of such stamps I would like to look up. Online would be great, physical guides that need to be purchased would be fine too. Thanks in advance.
Where can I buy vintage, valid US postage stamps for face value or near face value? [more inside]
Where can I buy first class postage online? I need to be able to choose a custom rate (say, $1.57). [more inside]
How is the authenticity of a postage stamp verified in the normal mail delivery process? [more inside]