Pelikan M100 fountain pens

The model M100 (Old Style) was produced from 1985 to 1997. In the beginning only a black fountain pen there were different colors later. The trim and nib was silver colored; only the model M100 in white has different trim and nib in black.
The pen was redesigned in 1997; the beveled cap ring became a flat one and a trim ring was added on the filling knob.

Weight	Total Length	Barrel Length	Cap Length	Diameter	Ink Capacity
0.39 oz	4.80 in	3.90 in	2.17 in	0.43 in	1.18 ml
11.1 g	122 mm	99 mm	55 mm	11 mm

The model M150 was produced in 1983. The trims are gold plated. Until 1986, it was also named M150 / 481 however, the logo was still visible on top of the cap, different to the model 481 (see M200 basis).
As of 1997, the M150 was redesigned. The design before is called M150 (Old Style).

Weight	Total Length	Barrel Length	Cap Length	Diameter	Ink Capacity
0.39 oz	4.80 in	3.90 in	2.17 in	0.43 in	1.18 ml
11.1 g	122 mm	99 mm	55 mm	11 mm

Redesigned version of the M150 model produced since 1983 (Old Style).
The cap ring is flat, not beveled, and a trim ring has been added on the filling knob. The trims are gold plated.

Weight	Total Length	Barrel Length	Cap Length	Diameter	Ink Capacity
0.41 oz	4.76 in	3.90 in	2.13 in	0.43 in	1.18 ml
11.6 g	121 mm	99 mm	54 mm	11 mm

The model MC110 has a shape reminiscent in style of old dip pens. It was made available in different calligraphy sets. There are several nibs and a nib changing tool. The available nib sizes were: 0.75mm, 1.00mm, 1.25mm, 1.5mm, 1.75mm, 2.00mm and EF, F, ML, BL, BBL.

Later Calligraphy pens were produced as cartridge fillers (see here).

Weight	Total Length	Barrel Length	Cap Length	Diameter	Ink Capacity
0.45 oz	7.20 in	6.97 in	2.17 in	0.43 in	1.18 ml
12.8 g	183 mm	177 mm	55 mm	11 mm

The model MC120 is an M150 in a set for calligraphy with a variety of nibs and a nib changing tool.

The model MC120 was made for the American market.
Later Calligraphy fountain pens were produced as cartridge fillers (see here).

Weight	Total Length	Barrel Length	Cap Length	Diameter	Ink Capacity
0.39 in	4.76 in	3.90 in	2.17 in	0.43 in	1.18 ml
11.1 g	121 mm	99 mm	55 mm	11 mm