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Nice to meet you UrbanEnthusiast, I see you're in my neck of the woods
There is not a whole lot of sourced information in English (I've started working on some translations, but it will take me a while), but you can get the basic facts by visiting this page http://aviandiv.tzv.fal.de/aviandiv/perl/query_db.pl (select "Icelandic landrace") which contains information collected by the United Nations' FAO in 1998-2000 for a diversity project called AvianDiv. There are a few errors, like the breed is 1100 years old, not 900 years old (someone subtracted 900 from 2000 and got 900...) and they do not lay brown eggs, but white/cream/extremely light beige. It's a good starting point though. It states that they lay 180 eggs per year (when they're in Iceland, 65 degrees North), which I assume is without supplementing with artificial lighting over the winter months.
(edited for grammar)