ClipArt ETC
"A circular box used for covering and protecting a seal. Old documents were commonly sealed by means of a ribbon which passed through the parchment, and to which was affixed a large circular wax seal, not attached to the parchment itself, but hanging below its edge. The skippet used to protect such a seal was commonly turned of wood, like a shallow box, with a cover formed of a simple disk of wood held to the box by strings passed through eyelet-holes." -Whitney, 1889

Skippet - Open Box with a Seal Inside

"A circular box used for covering and protecting a seal. Old documents were commonly sealed by means…