No, not one member of the Scherembeke family ever used a COA which was not exisiting then, but was created by Gustav Vasa after apr 1540.
COA = ?!? ”Certificate of Authenticity” or what an earth that abbreviation means? - Why can't people use whole sentences instead of abbreviations?!
Sorry but for most genealogists, COA means Coat of Arms. Heraldry weapon.