So essentially, how many of the (seemingly randomly picked) coin types featured in the Numista header do you currently own in your collection?
I've tried to ID them here from left to right, but feel free to correct me if you notice any faults:
1. Argentina 1 Peso:
https://en.numista.com/catalogue/pieces2217.html
2. Taiwan 1/2 Yuan:
https://en.numista.com/catalogue/pieces6825.html
3. UK Elizabeth II 4th bust penny or 2p:
https://en.numista.com/catalogue/index.php?mode=avance&p=1&l=royaume-uni&r=4th+portrait&e=royaume-uni&d=&ca=3&no=&i=&v=&m=copper+plated+steel&a=&t=&dg=&w=&u=&f=&g=Ian+Rank-Broadley&c=&tb=y&tc=y&tn=y&tp=y&tt=y&te=y&cat=y
4. France 12 Deniers/Sous Louis XVI:
https://en.numista.com/catalogue/index.php?mode=simplifie&p=1&l=france_royaume&r=12+deniers+la+nation&e=france_royaume&d=&ca=3&no=&i=&v=&m=&a=&t=&dg=&w=&u=&f=&g=&c=&tb=y&tc=y&tn=y&tp=y&tt=y&te=y&cat=y
5. USA Mercury Dime:
https://en.numista.com/catalogue/pieces51.html
6. Greece - Ancient Athenian Owl coin:
https://en.numista.com/catalogue/pieces34551.html
(not sure this is the exact coin)
7. Greece 1 Euro:
https://en.numista.com/catalogue/index.php?mode=avance&p=1&l=grece&r=1+euro&e=grece&d=&ca=3&no=&i=&v=1+euro&m=&a=&t=23&dg=&w=&u=&f=&g=&c=&tb=y&tc=y&tn=y&tp=y&tt=y&te=y&cat=y
8. Australia 20 Cents (portrait type unknown):
https://en.numista.com/catalogue/pieces1003.html
https://en.numista.com/catalogue/pieces1703.html
https://en.numista.com/catalogue/pieces1702.html
9. France 10 or 50 Euro Cent:
https://en.numista.com/catalogue/pieces100.html
https://en.numista.com/catalogue/pieces3510.html
https://en.numista.com/catalogue/pieces102.html
https://en.numista.com/catalogue/pieces6374.html
(possibly also the 20 cent)
10. USA Lincoln Cent (reverse unknown):
https://en.numista.com/catalogue/index.php?mode=avance&p=1&l=etats-unis&r=lincoln+cent&e=etats-unis&d=lincoln&ca=3&no=&i=&v=1+cent&m=&a=&t=&dg=&w=&u=&f=&g=&c=&tb=y&tc=y&tn=y&tp=y&tt=y&te=y&cat=y
11. Thailand 5 Baht Rama IX:
https://en.numista.com/catalogue/pieces1640.html
https://en.numista.com/catalogue/pieces7236.html
12. East Germany 1 Mark:
https://en.numista.com/catalogue/pieces6076.html
(possibly a lower denomination or the 2 Mark coin)
13. France 5 Francs Napoleon (Empereur):
https://en.numista.com/catalogue/index.php?mode=simplifie&p=1&l=france&r=5+francs+napoleon+I+empereur&e=france&d=&ca=3&no=&i=&v=&m=&a=&t=&dg=&w=&u=&f=&g=&c=&tb=y&tc=y&tn=y&tp=y&tt=y&te=y&cat=y
(possibly a lower denomination)
14. France 10 Francs Montesquieu:
https://en.numista.com/catalogue/pieces1196.html
15. Canada 1 Cent - Elizabeth II 12 sided type (portrait type unknown):
https://en.numista.com/catalogue/pieces425.html
https://en.numista.com/catalogue/pieces427.html
16. Western African states (BCEAO) 100 Francs:
https://en.numista.com/catalogue/pieces1372.html
(possibly a lower denomination)
17 Taiwan 1/2 Yuan:
https://en.numista.com/catalogue/pieces6825.html
(same coin as No.2)
Not going to bother with the big pile of coins on the far right for obvious reasons.
I myself currently own Numbers 3, 4, 5, 8, 9, 10, 11, 12, 13, 15, and 16 (and possibly number 7).
Would be pretty cool to see someone who owns all of them to line them up and photograph them as they are positioned in the header.... though the biggest obstacle is probably that ancient Athenian coin.