The ornamental design for spectacles, as shown and described.
1. Spectacles
1.1: Front
1.2: Back
1.3: Top
1.4: Bottom
1.5: Left
1.6: Enlarged front view of the left lens
1.7: Enlarged back view of the left lens
The broken lines in figs. 1.1-1.5are for the purpose of illustrating portions of the spectacles that form no part of the claimed design; the broken curved lines inside of the parts drawn by the solid lines in figs. 1.6and 1.7are for the purpose of illustrating lines that are visible when the left lens is viewed close up and that form no part of the claimed design; the broken lines outside of the parts drawn by the solid lines in figs. 1.6and 1.7are for the purpose of illustrating portions of the spectacles that form no part of the claimed design; and a right view of spectacles and enlarged front and back views of the right lens are omitted because they are mirror images of figs. 1.5, 1.6, and 1.7, respectively.