The M100 was initially released in 1985, likely the black variant first followed by several colored models.  They are distinguished by the derby cap top and rhodium colored trim.  The exception to that rule is the white model that has its trim painted black.  The cap band and lip are beveled and there is no trim ring on the barrel.  These were discontinued before 1997 and therefore there is only one style of trim for this model.  This model shares similar styling as the MC110 calligraphy pen.  The nibs of these pens are stainless steel.

 

Total Length	Barrel Length	Cap Length	Posted Length	Diameter	Weight
4.72 in	3.23 in	2.13 in	5.71 in	0.43 in	0.39 oz

 

Barrel Color	Cap Color
Green	Green
Red	Red
Dark Blue	Dark Blue
Black (1985)	Black
White (1987)	White (Black Trim)