'Vintage' Blade

[Geofnay]

I've posted this on another board too. My own research has drawn a blank.
Amongst some Schicks and Personna's I recently snagged I found, tucked in a box, a wrapped blade which declares itself to be "diamond edged, ultra sharp, made in Sweden." It's stainless steel and has diamond symbols on each side but no indication of the maker. Anyone got any clues as to what it might be?

 

[NotTheStig]

Do you have a photo?

 

[Geofnay]

[attachment=12511]
Best I can do I'm afraid. The bottom lettering reads 'Ultra sharp Made in Sweden. The rest is reasonably readable.