- Mill: Loch
- Weight: 11 oz.
- Clan Motto: Fide Et Fortitudine ("By fidelity and fortitude")
- Known Septs Include: MACAY, MACHAY, MACKAY, SEATH, SETH, SHEACH, SHIACH
This sett was published by McIan (c.1845) in a drawing of Farquhar Shaw of the Black Watch, who was executed for mutiny in 1743. Co-author, James Logan, describes the figure as wearing the 'regimental' tartan with a red line to distinguish the philabeg from the belted plaid. The Shaw tartan, it appears, had been derived from errors in the graphic illustration of the Black Watch.