Vintage BULOVA Nov 1974 Technical Letters 20-22
Letter# 20 - Bulova Accuquartz Digital Watch Series 228
Letter# 21 - Accutron 221 - Replacing the Stem
Letter# 22 - Mini Accutron Identification
The letters are in pristine condition other than the fold creases. They have been folded in the original envelope for decades. The envelope is in condition seen in pictures and does have rips on the sides.