Thanks for the info. I’m not sure who Winifred S Slack was. Bill Slack was married to Christina Winifred Rollafson. Bill, along with his son Harry, ran Waldorf Aero & Auto. So this definitely places the photo in the early 1930’s. Bill Slack and his wife were killed in an air raid on Glasgow on 13 March 1941 – first night of the Clydebank Blitz.