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@DJPinATL
Here's a glance on the HS 81.4 "Sekundenarret"-movement with a second-stop on 60, when the crown is pulled:

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Guinand modified only a total of twelve movements for the "Instrument 91"-model with the last parts needed for the modification of the Unitas.

Guinand produced this movement since the late 90s mainly for the Series 031 and also supplied Stowa with this movement.

Today I wear my oldest watch of Helmut Sinn with the HS 81.

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Ref. C 031-2 HS from 1998
 
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