<p>180就象双面笔,详细介绍请看以下英文介绍。</p><p>In 1979, a new, elegantly slender pen appeared, called the <strong>arker 180.</strong> The 180 was a strange beast. Instead of an ordinary fountain pen’s arched nib, it featured the radically different nib shown to the right here, shaped like an arrowhead and almost flat, with a very slight lengthwise crease but no arch, and with a feed along one surface and a stainless-steel reinforcing bar along the other. <img height="135" alt="arker 180 nib" src="http://www.richardspens.com/images/ref_info/180_profile/180_nib.jpg" width="350" align="right"/> The principal selling feature of the Parker 180 was that it could write in two orientations: normally, nib upward (the usual way); and finer with the pen turned 180° so that the feed faces upward. whence the pen’s model designation. Two nib configurations offered the purchaser a choice between Fine/Broad and Extra Fine/Medium point sizes, with the sizes marked on the under surface of the feed. </p>