The M150 was initially released in 1985, likely the black variant first followed by several colored models.  These pens are the same size as the M100 and the two are often mistaken for each other.  The easy way to tell the difference is that the M100 has rhodium trim and the M150 has gold trim.  There are two trim variants of M150, depending on the year of release.  Pelikan restyled their trim levels in 1997 resulting in pre-’97 and post-’97 trim variations.  The pre-’97 pens are distinguished by a derby cap top, gold colored trim, absence of a trim ring on the barrel, and the cap band and lip are beveled.  The post-’97 pens have a crown cap top, gold colored trim, trim ring at the piston knob, and the cap band is no longer beveled.  These pens are styled similarly to the MC120 calligraphy pen.  The nibs of these pens are gold plated stainless steel.  It should be noted that the post-’97 M150 trim variant with green barrel and black cap has been sold in the Italian market under the model name M151.

 

Trim	Total Length	Barrel Length	Cap Length	Posted Length	Diameter	Weight
Pre-’97	4.72 in	3.23 in	2.13 in	5.71 in	0.43 in	0.39 oz
Post-’97	4.72 in	3.23 in	2.13 in	5.71 in	0.43 in	0.39 oz

Pre-1997 Trim 

Barrel Color	Cap Color
Green*	Black
Black (1985)	Black
Black	Grey
Black	Burgundy
Blue Transparent Demonstrator (1994)**	Blue Transparent Demonstrator

*Initial release designated M150/481 resulting in confusion with the actual M481 model.  Subsequently changed by Pelikan to model M150 for clarity.

**1994 limited edition release of 3000 pieces (not numbered) for the Bols distilled spirit brand

 

 

 

 

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Post-1997 Trim

Barrel Color	Cap Color
Green*	Black
Black	Black
Black (1996)	Grey
Black (1996)	Burgundy
Black	Green

*Also released as a 170th Anniversary edition circa 2008.  The regular issue and special issue pens are identical with the difference being that the Anniversary edition came with a special booklet and packaging.  In addition, this pen is known as an M151 in the Italian market.