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Croma posted a topic in MontblancRigidity Index of the new Meisterstück Calligraphy 149 Expression Nib In September 2019 Montblanc introduced to the market a new collection of fountain pens called “Calligraphy” that have as their central core a flexible nib called “Expression”. In this presentation, we briefly discuss the new Meisterstück 149 equipped with an Expression nib made of 18kt yellow gold. This version is called "Montblanc Calligraphy Flexible Nib Special Edition". The base is the famous 149 made of black resin and with yellow gold trims. The pen has a total weight of 33.1 grams with ink (22.3 grams, without cap and with ink) and a closed length of 15 cm and 13.5 cm without cap. All of its elements are the same as the standard 149 pen, including the ABS plastic feeder. The Montblanc Calligraphy 149 has a very fine nib, EF-type nib if written without pressure, with a line width of 0.3 mm. When applying pressure, the flexibility of the tines is felt and a stroke up to 1.4 mm wide can be generated, according to the official press release. In our tests we have untroubledly achieved strokes of 1.2 mm width. We have also achieved almost 2 mm strokes with formation of "railroads" in many cases (this depends on the fluidity of the ink used). All this performance without excessive pressure and with a complete recovery of the nib when the effort ceases. Due to our support angle we have not experienced feeder friction on paper in our tests. The bending capacity of the Flexible Nib Expression is excellent and applying the methodology of characterization of the Rigidity Index (see link below), that allows us an objective assessment, we obtained the following measured data (237-217-261-271-256-253-268-245-265-289-282), with an average value obtained of 284.4. This value characterizes this nib like an IR2/FLEXIBLE. So it is a flexible nib that offers the feeling of being writing with a dip pen but with the cleanliness, softness and touch of a high-end fountain pen with the best performance. Only we can propose an improvement to this wonder with a traditional ebonite feeder, which would certainly improved the ink flow in major openings (this is something that can be solved at the buyer's own risk). Thanks for reading and best regards. Thanks to ValenSpain for special contribution in the realization of this analysis. References. Press Release: “The Fusion of Art and Writing: Montblanc Meisterstück Calligraphy Collection, a Tribute to the Beauty of Handwritten Self-Expression”. https://www.fountainpennetwork.com/forum/topic/343637-mb-149-expression-nib-calligraphy/ https://www.montblanc.com/en-shop/collection/writing-instruments/meisterstueck/119700-meisterstueck-sol-gold-leaf-flex-nib-fountain-pen.html https://www.relojes-especiales.com/foros/estilograficas/indice-de-rigidez-metodo-sencillo-para-valorar-flexibilidad-de-plumin-368039/ https://www.fountainpennetwork.com/forum/topic/291773-rigidity-index-a-simple-method-to-evaluate-the-flexibility-of-a-nib/ http://estilograficas.mforos.com/2126518/12874704-metodo-sencillo-para-cuantificar-la-flexibilidad-de-un-plumin-indice-de-rigidez/ http://vintagepensblog.blogspot.com.es/2015/07/measuring-nib-flexibility.html https://fountainpendesign.wordpress.com/fountain-pen-nib/flex-nibs-experience/flex-nib-quantitative-classification/