I'm trying to get this unknown pen from a pen lot purchase back in working order, It has "Arrow" written on the lever and a Signature 4 Made In USA Nib (See pics). Unfortunately, the clip is broken off so I can't be certain about the make of the pen. When I search for arrow pens all I get is Parker variants.
Also, the clip slot is perpendicular to the barrel and it seems that a s shaped clip would work as a replacement. When I took out the inner cap a small tab fell out which I assume is what held the clip in place. However, I don't know what these types of clips are called and therefore can't search for them. If anyone can help, or knows of a source for these types of clips, it would be appreciated.