Trying to figure out when my Sennheiser MD421-N was made

Updated
Mark K.
So I have this really old sennheiser MD421-N. It's black with a gold grille... it says MD421-N at the serial numer plate and it has the 5 way bass roll off. It also has a Din input, not an XLR! So I did a bit of research and I found that sennheiser made a special 90 years aniversary edition (only 990 made), the MD421-SE, which is black with a gold grille. But the SE has an XLR input. any idea's?
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