The Pick Pen Company was located in Cincinnati, Ohio, and therefore occupies a soft spot in this Ohio boy's heart.  The early flattops were very high quality and were marked with the company's "Exceptional" logo.  Later examples of Pick products all bear the unique, rounded capped with a flattened cylindrical top.

The example stamped "S.W.P. Co." has to be a Pick, but I'm not sure what the S.W. was all about.  Anyone that knows, please do share!