a rather interesting movement. It prooves my suspicion that it was designed to have the choice between sub second and sweep second. Unfortunately this movement line is less than poorly documented, and even Longines could give no substantial contribution. Given that the last ever printed movement registers are the Bestfit and the Flume K3, both from 1972, and that the Flume is the only one mentioning some of these calibres, they should have been designed around 1970, most probably by Record.
Before I saw the one above, just 4 variants were known to exist, from only 3 the features were known, and only one of them was used by both, Longines and Record. Of course I'll enter this additional variant, and hopefully I'll notice further variants any time in th future.
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