Just wanted to add that I recently came into a '82 Specialized Sequoia, and in looking for info on it via the Classic Rendezvous and other lists, learned from folks that were with Specialized at the time that Miki built some of Specialized bikes back then, including mine. The serial number is shown in the photo attached.
Hope that comes through. If not, the number is M2D03667. The 0 is not 100% sure... it looks like an incompletely stamped 0 but maybe not???
Tim