The lowest ID I received is from Kazakhstan.
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Ah! I received KZ-63703 recently. But today I went one stage further - GH-5795 arrived and it took only seven days! Super 
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Mine is Postcard ST-208
I think I have another 3 digit card iD from an exotic country and a couple of 4 digit card iDs
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I have recieved KN-21 and KN-22 as my lowest ID ever.
The lowest ID sent is MF-129
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Not very low for me 
It was from Bosnia Herzegovina
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This is my new lowest card, which was also my 500th card received, if I remember correctly:
Lowest sent:
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My two lowest! Burkina-faso and the Aland Islands
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My lowest card IDs (I think the only 4-digit ones I have) are from Bahrain in 2018
French Polynesia in 2019
and Argentina in 2011
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Wow! I’ve never thought about this topic… it’s interesting. unfortunately, I have never received postcards with such short numbers, but I have been in postcrossing not so long ago…
Today I received a postcard from the Faroe Islands! For me, this postcard also has an emotional personal value and I am so grateful that the sender drew my address during their holiday and while using Postcrossing’s Travel mode! It is generally the lowest ID I have received so far. Love the postcard motif, the stamp and the postmark from the capital Tórshavn, which was beautifully neatly cancelled on the stamp! 
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My lowest is from Cabo Verde. I was so excited to receive it!
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I love this topic!
Fascinating to see how many postings this wonderful site has generated…
My lowest ID number is AX-2024, posted 5 years ago, from the Aland Islands 
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My lowest numbers were JM-98 (Jamaica) and VA-112 (Vatican City), but these were received many years ago.
These days, I’m the one sending the low numbers from various Travel Mode locations.
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I thought it was BB-983 (Barbados) 22 February 2021, but it’s actually MV-656 (Maldives) 12 June 2022!
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