As @Xavier said in this topic a new forum thread should be opened to ask about micronations.
I bought an expensive Sealand coin because was in the Numista (a site that I thrust) as a Micronation.
But since everything is mixed and blended now, Sealand Coins are in a confuse category, under “Pretend Issuer” a sub-category of fantasy coins.
Fantasy coins are just round metals with something written in it, I can make some, you can too. That is pure fantasy.
Apart to that, we have the story of Sealand:

The Principality of Sealand, also called the “world's smallest country”, is a self-declared micronation established in 1967 by Roy Bates on Roughs Tower, a decommissioned WWII sea fort located in international waters off the coast of England.
Originally intended for pirate radio broadcasts, Bates instead declared the platform an indepndent nation. Sealand's claim to sovereignty gained attention after a 1968 British court ruled it fell outside UK jurisdiction.
In 1978, a dramatic coup attempt by German and Dutch businessmen, during which Bates’ son was briefly taken hostage, ended with the invaders being captured and held as ‘prisoners of war’. The involvement of a German diplomat negotiating their release led Sealand to claim indirect recognition, though no official recognition has been granted by any country.
Despite its unrecognized status, Sealand remains an enduring symbol of sovereignty and eccentric independence
Different from these dumb exonumia invented by people, Sealand issued coins to raise funds, those coins are not brass cheap coins, but silver and gold were used.
The coins of Sealand are expensive and sought by collectors, because there is this amazing background story behind them, and they were made by the Bates family and not in a basement for someone just trying to fool collectors inventing coins without any relation with the country or pretended country.
Sealand coins should not be side-by-side with other fantasy items and in an obscure place in the catalog, even hard to find for the novice collector using the site.
Those who do not want to “see” the coins in the catalog can just ignore them, it is unfair to hide them for everyone just because some more active forum members don't like them.
Sealand on Ucoin:
https://en.ucoin.net/catalog/?country=sealand
Sealand official site:
https://sealandgov.org/en-sa/pages/the-story
Story of Bates:
https://en.wikipedia.org/wiki/Paddy_Roy_Bates#cite_note-Interview-4
Sealand articles:
https://www.brownandhudson.com/where-to-why/article/sealand
Sealand on news:
https://www.cbsnews.com/news/micronation-sealand-bates-royal-family-60-minutes-transcript/
Browsing the fantasy items will be very clear the disruption between Sealand Coins and other foolish pieces of metal.
Of course, if the esteemed referees consider it all the same, please ignore this request.
Thank you for the space.
Geison

