Okay, so now I’m super curious - who makes these & is there a web address on the card? This could become a thing eh if there are others 
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Here is a good video about the sound postcards
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Really hope to buy/make/send/receive flower seed postcards one day! Will obviously have to be to/from countries that allow plant goods via mail. Example 1: seeds in a package, Example 2: seeds pressed in the paper
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I received one with embedded mini spice bottles before.
This is the only photo I have on hand for it. The back of the plastic box actually had the lines for stamp+address, like any normal postcard.
I also have this wooden one with rubber stamp.
The back of the card was a fullpage sticker, I guess to keep the items in place.
And this one is made of unfinished japanese paper. I guess this is more towards ‘standardise’ than the ‘unusual’ of the scale.
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Wow, that spice bottle card is amazing. Were there spices in there, or were the bottles empty? Either way, I doubt I could send a card like that from Germany…
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Except these can be sent from Germany, which blows my mind, lol
Recently bought a set of postcards made out of Cartamela (Apfelpapier, paper made out of apples).
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So I have to ask, lol - have you tasted the paper?
Haha, no problem to ask - and no - not in these pandemic times! 
It feels and smells like normal paper. The colour of the backside is light beige with very little kind of grey dots/sprinkles. So it has a kind of vintage look for me. 
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Sorry I had to ask - I’d probably try licking them, lol - interesting that there’s no particular smell to them.
I know you can make paper from all kinds of plant matter - I’m done some workshops, but I can’t say I’ve come across using apples yet.
I found some of my unusual cards
Sewn, no envelope used, sent from USA with standard postage:
And here the picture is half-see through, some kind of plastic? Also sent without envelope. I don’t know if sent with standard postage, it was sent from Taiwan and the stamp says “17”.
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With real spices that can be used for cooking 
The quantity was too little to be used to make a real meal, but it was good to sampling.
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The “flaschenpost” and “dosenpost” cards are specifically designed to be a basically rectangular shape and just thin enough to qualify under the “maxi-letter” form. My translation from the DeutschePost site:
"The sending of a so-called “Bottle letter” as a letter is possible, if the the body of the bottle (excluding the neck) is rectangular and flattened and the minimal dimentions of 100 x 70 mm is met.
"Flattened means, that the the body of the bottle is not round, but flat (like, for example, a flask) and the bottom of the bottal has an oval form. The dimensions of the bottom should be 2:1, that is, the length should be twice as wide as the breadth.
“The bottle must be unbreakable.”
In researching this I discovered (because it is on the same page) that there is an exception to the rule about shaped cards having to be sent in envelopes:
"Exception! “Beer coasters” that have a square form with a minimum dimension of 125 x 125 mm can also be sent without an envelope as a “large letter.”
This means it costs €1,55 to send Flaschen- or Dosen-Post inside Germany and €3,70 to send internationally. So I think for most of us these are reserved for friends or people with very nice profiles!
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So cool! What a treasure…
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Thanks for the translation - still blows my mind they can be sent, but hey the more interesting, the merrier!
I have one that folds into a kaleidoscope
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Wow cool! does it have coloured windows or the free floating bits as well?
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Better off buying a cup of joe and wishing it came from a pc!!
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Another amazing fact! 
Even better, USED beer coasters to get the beer aroma!