Clan Sinclair Seal with motto:
"Commit thy work to God"
All of the churches in Normandy have a Rooster on one steeple to signify that the church is completed and consecrated. The Cock proper in the Sinclair seal signifies watchfulness and is also a symbol of justice. Being from Normandy, the Sinclairs used this symbol denoting their Norman Ancestry as it is unique to Normandy.
Thanks to David Sinclair Bouschor, President of Clan Sinclair USA, for the explanation of the rooster imagery in the Clan Sinclair Seal.