Date registered: Feb 2008
Vehicle: 2004 W220 (S430) ; 2001 R129 (SL500) Sport
Location: Alabama Gulf Coast--formerly Charlottesville, VA
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Relative to what? If it's a European version, it probably isn't all that rare. If it's a 250 or a 280S probably nobody would care. If it's a 280SE and it's in the US, it's probably pretty uncommon. I don't know how many or if any manual transmission W108s were sent to the U.S. The lower power versions may have been plentiful.
If you already know the answer, why are you asking the question? If you don't, Google W108 and ask one of the groups that owns them. Beyond the speculation above, that's all the help I have.
"Don't pick a fight with an old man. If he is too old to fight, he'll just kill you."--John Steinbeck