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In 1933 was created a very special re-entrant nib mounted on a spring that was made by screwing the cap back by the pressure of an inner tip (see nº FR-737930). This system, along with the re-entrant nib, was used in the new model 303B, produced in three versions corresponding to three different sizes. The loading was a refinement of the previous system of 303 and was also used for the model 303C, without re-entrant nib, which in addition to the three previous versions was made in celluloid and with a fourth size, large enough to call it Mastodonte.