Police and relatives of Gordon Wilson are growing increasingly concerned for his welfare.
Mr Wilson, 82, from Leaden Roding, was last seen by neighbours at about 11am on Sunday, October 25.
He always has Sunday lunch with his daughter Lesley Rankin, who called him at 2pm to let him know that the clocks had gone back an hour.
However, he did not answer the phone and was not at home when she arrived to collect him at 4pm.
Mr Wilson, who has vascular dementia, is understood to have left home on foot with a small amount of cash and some of his medication.
Police believe he was seen at Chelmsford bus station at 12.52pm on Sunday, where he got off the Arriva 59 bus, which runs between Harlow and Chelmsford.
Mr Wilson’s daughter Gillian Wilson said: "We think there is a high possibility he is trying to go to Glasgow.
"He moved from Scotland to Essex 11 years ago and spent 71 years in Glasgow, where he was a former headmaster at Shawlands Academy, so knows the city well.
"Many of his former pupils are Tweeting and sharing posts on Facebook as part of the appeal to find him and we are touched by everyone’s concern and assistance.”
Mr Wilson is known to enjoy long walks and has a bus pass that he may be using to travel.
His daughters said his ill health means he can become confused and have difficulty speaking.
Chief Insp Alan Cook said: "We are continuing to make extensive enquiries to find Mr Wilson and would appeal for anyone who has seen him to contact us as a matter of urgency.”
Mr Wilson is described as 5ft 11ins tall, of medium build with grey thinning hair. He wears glasses and was last seen wearing a sports jacket which is either checked or navy, and will usually wear a shirt, tie and jumper.
Anyone who sees him is asked to contact police at Chelmsford on 101.
Why are you making commenting on The Herald only available to subscribers?
It should have been a safe space for informed debate, somewhere for readers to discuss issues around the biggest stories of the day, but all too often the below the line comments on most websites have become bogged down by off-topic discussions and abuse.
heraldscotland.com is tackling this problem by allowing only subscribers to comment.
We are doing this to improve the experience for our loyal readers and we believe it will reduce the ability of trolls and troublemakers, who occasionally find their way onto our site, to abuse our journalists and readers. We also hope it will help the comments section fulfil its promise as a part of Scotland's conversation with itself.
We are lucky at The Herald. We are read by an informed, educated readership who can add their knowledge and insights to our stories.
That is invaluable.
We are making the subscriber-only change to support our valued readers, who tell us they don't want the site cluttered up with irrelevant comments, untruths and abuse.
In the past, the journalist’s job was to collect and distribute information to the audience. Technology means that readers can shape a discussion. We look forward to hearing from you on heraldscotland.com
Comments & Moderation
Readers’ comments: You are personally liable for the content of any comments you upload to this website, so please act responsibly. We do not pre-moderate or monitor readers’ comments appearing on our websites, but we do post-moderate in response to complaints we receive or otherwise when a potential problem comes to our attention. You can make a complaint by using the ‘report this post’ link . We may then apply our discretion under the user terms to amend or delete comments.
Post moderation is undertaken full-time 9am-6pm on weekdays, and on a part-time basis outwith those hours.
Read the rules here