That one has brown/tan trim and I agree it does look like a Sandman at first glance. So if it is it is pre 10/78 build as it must be 67V trim. Otherwise if it is a later car which it probably would be if specially built for the purpose as the rally was in August 1979 it can't be a Sandman, unless the trim was changed. If it is a Sandman more than likely this car was in plant stock and grabbed by John Sheppard for the rally. If it isn't a Sandman it could have been ordered and built for the purpose.