I've just stumbled across this group buy after being away from the forum for some time but I am interested in joining for the Extra set so that I have the keys needed for an ISO set. I was just wondering why the ISO hash key isn't included?
This one:
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So, as I've explained a few times..
ISO is the layout of key sizes. There are many, many regional ISO layouts with different legends. UK ISO is just one of them.
Originally the extra set contained the keys necessary for a perfect US ANSI -> UK ISO conversion, however it was an expensive and large set at the time (53 keys). I decided to cut a lot of things out. One of the things I did was switch UK ISO to US ISO. US ISO requires the lowest number of keys for a conversion. It means that everyone will be able to fill an ISO keyboard with this keyset, just not with their regional legends.
Having that blank R4 key or having a \| key instead are both equally valid for US ISO, and I have been considering swapping the blank for a \| key. I still may do this.