1520 III. i. 393 [For John Bourgchier.., deputy of Calais.., with 100l. a year for himself and 104l. a year for] spiall money.
1565 T. Cooper Catascopium,..a spiall shippe: a brigantine or pinneise.
1609 T. Heywood 129 When lustful Men aime at suche horride use, They watch all Spyal-eyes and listning Eares.