unsight

a. Doing or done without sight; not seeing or examining. [ Colloq. ] [ 1913 Webster ]

Unsight unseen, a colloquial phrase, denoting unseeing unseen, or unseen repeated; as, to buy a thing unsight unseen, that is, without seeing it. [ 1913 Webster ]

For to subscribe, unsight, unseen,
To a new church discipline. Hudibras. [ 1913 Webster ]

There was a great confluence of chapmen, that resorted from every part, with a design to purchase, which they were to do “unsight unseen.” Spectator. [ 1913 Webster ]