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Case 670 calls out a 110ZACB movement like Mike pointed out.
That is a really nice (other) tuning fork collection!With the recent addition of the Citizen Hisonics it just about completes the “other”
watches using tuning fork fork movements wing of my collection.
With the exception of the USSR Slava Transistor 2937 all movement variants were licensed by Bulova. The Hisonics are caliber 218’s. the Slava a copy of the caliber 214 and the others utilize a ESA 9162/4 variant.
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