Perhaps Israel is issuing the stamps similar to Canada's with a layer of water activated something in between the adhesive layer and the paper stamp?? So you can soak them off the envelope paper?
If I understand the Liechtenstein new self-adhesive idea from reading here it is so you can keep the tabs connected to the stamps? I remembered that Canada had in 2005 issued a set of bridges (I didn't get them) and a stamp for the province of Alberta.
These had a layer of paper with printing , then a layer of adhesive, then the stamp, and the whole thing was perforated. The backs had pictures on them. Like having a booklet of self-adhesives perforated through the cardboard back. More expensive maybe? I wish Canada made tabs.
Not nearly as nice as the tabs on Israeli stamps but still along the same lines???
