Hessink had one for sale a while ago:
http://hessink.nl/Webalbum/thor/wapens/1396_frame.htm
There's also one on display in the Army Museum in Stockholm. I'm not sure if I forgot to take a picture of the museum's description, or if it might have been lacking altogether. Either way, I'm afraid I can't provide any information beyond the picture itself there. It's displayed in a manner suggesting it was a gunner's item though.