AC409: Swan Metal Pocket.

Date: c1920

Size: Length 4 3/4 inches.

The Swan Metal Pocket was made at a time when many fountain pens were made without a pocket clip.  If you had one of these pens and wanted to keep it safely in your pocket, you could buy one of these to use.  The tab at the front would grip the edge of the pocket just as a pocket clip would today and the pen would actually sit inside the clip.  This one is in excellent condition - just about all of its original blueing is still there and there is no tarmishing or other damage.