No. 20 Acquired 2020-2018. Created soon before.
Bookmark advertizing Astroedu, a joint education initiative between INAF (Istituto Nazionale Astrofisica) and the Società Astronomica Italiana (Italian Astronomical Society).
seen from Spain
seen from Türkiye

seen from United States
seen from Spain

seen from France
seen from Türkiye

seen from Canada

seen from United States
seen from Russia

seen from Canada
seen from United States

seen from Lebanon
seen from China

seen from Belgium
seen from United States
seen from United States
seen from Netherlands
seen from Spain
seen from Russia
seen from United Kingdom
No. 20 Acquired 2020-2018. Created soon before.
Bookmark advertizing Astroedu, a joint education initiative between INAF (Istituto Nazionale Astrofisica) and the Società Astronomica Italiana (Italian Astronomical Society).

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No. 18 Acquired september 2021, created soon before.
This bookmark came with the book "Four continents", of the series "Reading Classics", published by Black Cat. The back is completely blank, white in color.
No. 13 Acquired winter 2021, created 2000s-1970s
See 12. This one features a detail from Portrait of Adele Bloch-Bauer II by Gustav Klimt. I don't like this painting as much as the one in 12.
No. 12 Acquired winter 2021, created 2000s-1970s
Same origin as 11. On the front there's a detail of the painting Mermaids by Gustav Klimt. On the back the logo of the company that printed and designed it, and the title of the paintings pictured on the other bookmarks of the series "Le donne" - "The women".
This bookmark is an enigma to me. It was probably sold in a smallish art gallery in Florence, or nearby at the very least. I say this because I found 0 trace of the small company that made this (Artificio, based in Florence). It probably closed down well before the rise of the internet. However, very near the address listed on the bookmark there's an art gallery, still open to this day. I find it in no way implausible that in the past this company supplied the art gallery with bookmarks. At the end of the day, this is all basically wild speculation on my part.
No. 11 Acquired winter 2021 Created 2010s-2000s
This is a cut piece of a lipstick ad, being used as a bookmark. I got this when I helped to clean up my grandparents' bookcases. The date range is very wide because I was unable to find anything about it, and Google Street View doesn't show the supposedly "new" shops listed at the addresses on the back at any time from 2008. The paper seems fairly new, and there were some pretty big gaps in Google's photos, hence the inclusion of the 2010s as creation period.

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No. 9 Acquired winter 2018-spring 2019, created soon before.
I got this bookmark at the gift store of a solar observatory in Northern Italy, during a school field trip.
It's holographic on the front, and it displays the 8 planets and the Sun of the Solar system, ordered by distance from the Sun. In the background of the picture it shows the Milky Way, that shifts when viewed from different points of view, along with the names of the planets. On the back it has a chart with the avg diameter at the equator, mass, avg density, avg gravitational acceleration at the equator, length of day, synodic day, avg distance from the Sun and orbital period of the various planets of the solar system.
It's made of a layer of flexible plastic with a thin plastic coating on the back the chart is printed on. The front has shallow grooves on it, the back is smooth.
No. 7 Acquired summer 2019, created soon before.
See No. 5.
This one's subject is "To return." On the back it says "A single-material fridge made of polystyrene allows for an eco friendly management of its end of life." It's made of card stock, and the front has a metallic silver coating. The back is just grey instead.
No. 6 Acquired summer 2019, created soon before
See No.5.
This one's subject is wet waste: the text on the back reads
"Waste to Fuel
Today it's possible to convert wet waste to ship bio-oil and in components for the production of advanced fuels."
It's made out of cardstock and the front is made to shimmer subtly, to imitate slightly wavy water.