+1 for Slxtiesix I have a catalog from 1997 and there is a 3 m cable #46086 Release cord SK 150 for the side socket on page 32 that matches your picture.
http://www.jeffreyglasser.com/
Sorry Jeffrrey you are confused.
In that catalogue, page 32, you refer to the SK 150 that terminates in the button release not a minphone connector that the OP has
and it is 1.5m not 3m as you quote.
The picture/table is confusing but in the bottom picture the release button top left goes via 46086 and 1.5 m (yellow lines) and goes to the multiconnector.
The minphone connectors in that picture are intended for the front socket and also terminate in the release button.
Hasselblad do not list a multiconnector terminating in a miniphone/minijack it is a third party part for a Pocket Wizard to release the shutter.