The spear shaped / drop counter weight Chrono seconds hand only appeared on models for period 1963/64-1969 which included 105.002-62, 105.003-63 to 65, ST 145.003, 105.012-63 to 66 and 145.013-67 & 68. Therefore impossible, IMHO, that a 80's Speedmaster can be correct with this Chrono seconds hand.
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