It sure looks like a multi-bobbin (closed bottom) boat shuttle to me ....
have not seen one like it !
All the multi-bobbins that I have seen have 2 bobbins (on the closed bottom type) & only seen one triple-bobbin shuttle , which was an 'open' type .
Call me crazy , but when I magnify the image from K's site , I see what looks like letters/numbers running across on the center roller/bobbin !