Why a stamp booklet could carry value
A postage stamp is prepaid service: its face value represents postage that the issuing postal system will accept. A booklet therefore packages a known amount of value into small, lightweight pieces. Unlike cash, it does not need to be exchanged into another currency before it can be used for its intended purpose.
That portability mattered in illicit trade because value could be embedded in an ordinary-looking object and moved with goods or people. A recipient who could use the stamps—or pass them on to someone who could—might treat them as payment or as a claim worth reselling. The booklet was not money in the legal sense; its usefulness came from the postal service’s promise to honor the stamps and from the recipient’s ability to turn that promise into practical value.
The value depended on a local outlet
Stamps were not universally spendable. Their face value applied within the issuing postal system, and a buyer elsewhere might have little reason to accept them. To convert a booklet into usable value, someone needed access to mail that could use those stamps, or a willing buyer who could supply that access. The price might also be lower than the printed face value, reflecting the effort and risk of reselling them.
That limitation explains both the appeal and the tradeoff: booklets were compact and easy to transport, but their value traveled less freely than cash. They could help move purchasing power across a border only when a chain of people on the receiving side could make use of them.
