- Introduction
- Peculiar Stamp Issuing Entities
- Vended Stamps
- 3D Lenticular & Holograms - Depth, Motion, view Crosseyed & Anaglyphs (you need glasses).
- Metallics & Glossy Inks, Laquers & Foils
- Precious Metals and Jewels
- Odd Shapes and Perforation Methods
- Weird Papers, Cardboard, Cloth, Plastic & Wood (for metals, see above)
- Embossed & Bas-relief
- Glowing & Heat Sensitive
- Sounds & Smells
- Hidden Images - Microprinting, Scratch-off & Win
- Joint Issues (two countries on one issue)
- Errors, Varieties, Proofs and Miscellany
- You sell - we buy
- You want - We'll look for...
Single sheets and stamps simultaneously from more than one country.
In the 20th century, stamps were occasionally issued for use in more than one colony (had more than one colony's name on them). Modern issues such as the souvenir sheets below are different, in that they represent countries having voluntarily come together.
It's a relatively easy matter when both countries use a common international currency (the Euro being an obvious example), a little more difficult when the partners use different currency (Canada - USA or Ireland - Australia), and really unusual when both countries use the same currency (i.e., Switzerland - Liechtenstein).
Generally, even paired as below, only one stamp in the sheet is valid in one country - they are not interchangeable. Only in the case of Switzerland - Liechtenstein and in the case of colonial issues, have the same stamps inscribed with names of more than one country been valid in either issuing entity.
Note that stamps issued by one country that were valid in another (i.e., E. German stamps valid in W. Germany and W. Berlin around 1995 prior to unification) do not belong in this category of unusual stamps.
It's a relatively easy matter when both countries use a common international currency (the Euro being an obvious example), a little more difficult when the partners use different currency (Canada - USA or Ireland - Australia), and really unusual when both countries use the same currency (i.e., Switzerland - Liechtenstein).
Generally, even paired as below, only one stamp in the sheet is valid in one country - they are not interchangeable. Only in the case of Switzerland - Liechtenstein and in the case of colonial issues, have the same stamps inscribed with names of more than one country been valid in either issuing entity.
Note that stamps issued by one country that were valid in another (i.e., E. German stamps valid in W. Germany and W. Berlin around 1995 prior to unification) do not belong in this category of unusual stamps.

Dutch and Dutch-German sheetlet
Extremely unusual stamp issue. Both stamps printed by the Dutch (the German one without authorization). The German stamp is valid for postage in the Netherlands, but only tolerated in Germany. The German post office provided the Dutch with the printing plates and approval to reproduce it - but not as a stamp). Scarce.
$
100.00