What this song renders
The coins are real and they are the most physical evidence Erik’s Northumbrian kingship left. Silver pennies reading ·ERIC· ·REX· in two lines with a bare sword laid between them and triple pellets above and below; on the reverse a cross with pellets in the quarters and the moneyer’s legend around the rim. They are conventionally attributed to the second reign, 952–954, though scholarship is not unanimous that the two York types map neatly onto the two reigns rather than both falling inside one.
The type carries no mint signature at all. York is an attribution built from the moneyers, the style and the hoard context — not from anything written on the coin, unlike the earlier St Peter sword type which does name the city. The song leans on that: nothing in the frame names the mint, and the only legible lettering anywhere in the video is on the struck coin itself, because a die is cut incuse and mirror-reversed and can never be read straight.
What the single invents is the queen’s hand in it. No source connects Gunnhild to the coinage. “I named the silver,” “the name I put in their hands” — these are the same first-person claim the album makes at Track 03 with “I held the Humber for him twice,” and they belong to the witch-queen voice, not to the numismatic record. The bridge’s thousand-year jump to a finder in a ploughed English field is staged as her prophecy, not as a documented event.
Documented object, sagaic voice. The ERIC·REX sword pennies, the moneyer Ingelgar, and Erik’s second reign at Jórvík are all documented — in the coins themselves and in the English chronicles. Gunnhild’s authorship of the coinage is the album’s claim and appears in no source; so does the reading that the omission of her name was a slight rather than simply how coins worked.