The NICHROM nib with imperial eagle is no Montblanc nib and does not belong in a 236. Correct for the 236 is a nib size 6, be it as a gold or steel nib; the model number does not encode the line width but price class, construction and housing/nib size. Line widths are exclusively indicated with capital letters (e.g. F, M, B). With the third series ("III MONTBLANC III"), instead of numbers the letters a, b, c in a triangle were used, with a, b, c corresponding to the nib sizes 2, 4, 6. A 234 would consequently have a smaller nib than a 236.