I am guessing that the first 2 digits of the serial number reflect the year of manufacture, but this is just a guess.
This is a high-quality typewriter that is pretty scarce even in the country of its manufacture, Spain.
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Obsessive typewriterist, creator of The Classic Typewriter Page in 1995, editor of ETCetera 2006-2012 & 2015-, blogger, author of The Typewriter Revolution: A Typist's Companion for the 21st Century (2015). E-mail: firstname.lastname@example.org