Purchased used in 1978. Manufacturers date stamped inside is 1974. Original grilles have been replaced by homemade grill using black transparent cloth. The originals were plastic with holes that obstructed the full sound stage and dispersion.
Note the "fried egg" tweeter used. These were also used on early Lifestyle series, but it appears some versions of the LS series did not use these desirable tweeters. The original foam surround on the tweeter crumbled, so replaced by felt weather stripping, dyed red to match the original color. This surround seems to be not just cosmetic, replacing it seemed to help the sound stage and clarity.
Original woofers surrounds were blue, midrange yellow. Very pretty when new. Both have been refoamed.