I know that this could have been someone else’s coat of arms but when I found this my first thought was that it is Kay’s Keys.
Image taken from page 728 of 'Geographisch-historisches Handbuch von Bayern' by The British Library Via Flickr: Image taken from: Title: "Geographisch-historisches Handbuch von Bayern" Author: GOETZ, Wilhelm - of Munich Shelfmark: "British Library HMNTS 10256.h.14." Volume: 01 Page: 728 Place of Publishing: München Date of Publishing: 1895 Issuance: monographic Identifier: 001449415 Explore: Find this item in the British Library catalogue, 'Explore'. Download the PDF for this book (volume: 01) Image found on book scan 728 (NB not necessarily a page number) Download the OCR-derived text for this volume: (plain text) or (json) Click here to see all the illustrations in this book and click here to browse other illustrations published in books in the same year. Order a higher quality version from here.