At the end of 1964, Pelikano underwent a fundamental revision from model 1 to model 2. The nib of model 2 became larger, more elastic, and semi-hooded. The barrel was equipped with an ink window. The cap became friction-fit. Accordingly, the design and construction of adult fountain pens were modified similarly in 1965. In the same year, all previous piston filler models (400NN, 140, and 120) were discontinued. With this, fountain pens with "classical design (open nib plus green and black combination)" disappeared from the catalogs, and in turn Pelikan introduced M60/M30 with a rolled gold cap and M20 with a Silvexa cap for the piston filler fountain pens. While all previous piston filler models were based on their predecessors and improved/modified upon them, M60/30/20 for adults was more a development of the school pen Pelikano (model 2) (Fig.1-3) than a development based on 400NN or 140. As the school pen Pelikano was a model based on P1 fountain pen for adults, just the opposite situation seems to have occurred. Come to think of it, these were the pioneering models of the era when Pelikan began to concentrate on the "Pelikano business". The piston filler models no longer dominated even in Pelikan (万年筆評価の部屋)⁽¹⁾.

Models M20/M30/M60 have some changes from Pelikano (model 1) and its original model P1 (naturally, they had much in common with Pelikano (Model 2)).

• Model name: The model naming system changed from those models. For piston filler pen, "M" was placed before the model number to denote "Mechanik-Kolbenfüllsystem" (mechanical piston filler system)⁽²⁾. M30 had a rolled gold cap and a black body. In terms of color and material, M30 was the successor to P1 RG (Fig.1-4)⁽³⁾. M60 had no direct predecessor, but in terms of color and material, it was the successor to 520NN. M20 with a Silvexa cap was the successor to P1 S. 

• ​Nib and thermic-regulator: The nib became larger than P1. The nib was greatly curved and its rear part was hidden in the section (semi-hooded)⁽⁵⁾. This made the nib more elastic than P1. As with P1, the nib had a slit but no vent hole (there was a circular imprint at the beginning of the slit: was it a marker for putting a slit in the nib?). There was also thin lines engraved on the edge of the nib (Fig.2-1)⁽⁴⁾. The models also had a new "thermic-regulator" that claimed leak-proof system⁽⁶⁾. The new thermic-regulator consists of the new designed feed and two tubes (the inner tube and the outer tube) around the feed (Fig.2-6). The ”thermic-regulator" is connected to the ink chamber by the perforated bulkhead (Fig.5 arrow head). The shape of the feed became more complex to fit the curvature of the nib (Fig.2-2, 2-4). Therefore, unlike P1, the nib cannot be pulled out or inserted by itself. Still, cleaning and replacing nibs and feeds was easier than in P1⁽⁵⁾. There are two grooves on the underside of the feed. These are ink channels, and these grooves lead halfway through the feed to the top surface of the feed, where they feed ink to the nib (Fig.2-7). There is a hole at the front end of the feed like P1. This hole extends further back into the feed (Fig.2-7). This hole is a main air channel and serves as an air intake during writing. Air enters the ink chamber through the openings of the feed and the tubes (Fig.2-7, 2-8). There is also a groove on the underside of the feed, which seems to be an auxiliary air channel (Fig.2-9). As was in P1, there are gaps around the feed and tubes  (Fig.2-8, 2-9), which seems to serve as a large compensation chamber (ink reservoir) and buffers against changes in air pressure and temperature, making it difficult for ink to leak (for further information, please see part1 and part2 (萬年筆グラフ 目録)). It is advised, after filling the reservoir, to drain a few drops of ink and screw the piston seal back on while holding the nib upward. By clearing the compensation chamber of the thermic-regulator, the ink flow can be controlled again (Ravens March Fountain Pens).

• Body: The body consists of the section, the barrel, and the filling system (Fig.5). The sections can be removed as described below⁽⁶⁾. There are no threads, instead, a metal ring to hold the cap in place is fitted onto the barrel (Fig.3-1). The barrel is also equipped with a circular ink window (Fig.3-1). What is different from the P1 is that the filling system is fixed to the barrel by a screw-in system (Fig.3-2). The filling system can also be removed by applying the special wrench and rotating it clockwise (Fig.3-3). Unlike before, the tip of the turning knob is now indented (Fig.3-4)⁽⁷⁾.

• Cap: The cap became friction-fit. When the cap was closed, friction between the metal inserted inside the cap (Fig.4-7) and the metal ring on the barrel hold the cap in place. The clip became so abstract in shape that it was no longer recognizable as the head or beak of a pelikan (Fig.4-1). Instead, the cap top was flattened and a pelican and two chicks were on it (Fig.4-6).

• Design:The tapered shape toward both ends was like P1, but the ends have been cut off, and the clip has become abstract, made entirely of straight lines. Thus, the new design became more linear and modern style (Fig.1-4).

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In 1966, the luxury model M100 all in solid gold was introduced.

 

Between 1966 and 1967, models MK10, MK20, MK21, and MK30 were introduced. They were less expensive models with plastic cap (K denoted "Kunststoff"(plastic)).

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With the 1968 revision of Pelikano, M/MK series was revised between 1969 and 1970. M30 was redesigned in 1970 (Pelikan-collectibles.com) and continued to be one of the Pelikan's standard piston filler pens.

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Note:⁽¹⁾Nevertheless, M30 was a fountain pen designed for contemporary design, usability, and maintainability.

⁽²⁾"P" was placed before the model number to denote "Patronen-Füllsystem"(cartridge filler system) (e.g. P30). Likewise, "D" before model number stood for "Druckstift (mechanical pencil)" and "K" for "Kugelschreiber (ballpoint pen)". 

⁽³⁾This period and after, Pelikan developed similar models for both piston fillers and cartridge fillers, except for the luxury models. No longer were piston filler models the only flagships. If I may say so, the flagship model was M30 and P30, and M60 was rather the luxury model.

⁽⁴⁾The lines were probably meant to be decorative, but they were also meant to distinguish the gold nib from the gold-plated nibs. Gold-plated nibs did not have these lines (Fig.2-3).

⁽⁵⁾Was the semi-hooded nib inspired by Parker 45? The model was introduced in 1960 and became very popular. Both fountain pens had an easily replaceable nib unit.

⁽⁶⁾The nib and thermic-regulator can be completely disassembled (not recommended). First, slowly rotate the section clockwise to remove it. Then, you can see the white gasket and black bulkhead from the ink chamber side. Carefully remove the gasket and bulkhead with tweezers. Next, carefully pull out the nib and feed with something like a rubber plate. Finally, the inner and outer tubes can be pulled out.

⁽⁷⁾To distinguish between piston filler pens and cartridge filler pens, a short metal cap was attached to the end of the barrel of cartridge filler pens.