Grumbacher Craft Knife swinging picture frame including the the numbering -

including the the numbering - "710" in this case--on the bottom

15ʺD × 1

and 2 1/2" deep

and there are a couple of other tiny chips around the rim--all as documented in photos

Grumbacher Craft Knife swinging picture frame including the the numbering -Established by Max Grumbacher in 1909 while hand making brushes at his kitchen table in New York City, the Grumbacher company went on to become an art materials empire. This high quality knife I believe was made in Japan and from what I can tell is no longer produced. Nice and substantial, it is easy to grip and use with precision. It appears to have been used but is in excellent condition and still very sharp. 7 1 4" long x 1" wide x 3 4" deep.