User blog comment:Euston.cpr/Green Viking Helmet code?/@comment-31347607-20170708182647

There isn't a code. The mods add the item to your account. You'll find the item in your inventory the next time you login after you are picked for POTW. This is the same for the book item you get for being featured in the newspaper.

I think the Staff have an item adder tool which allows them to add items to people's accounts directly.