This Stamford leather traveller's notebook - stamped with the famous silhoutte of Lovecraft - was produced by Paul Maclean and the good folks over at yog-sothoth.com (YSDC) as part of a fundraiser to cover the costs of hosting the site and producing their regular podcast, The Cthulhu Breakfast Club. The initial run of the notebooks (of which the one shown above was part) was produced as a limited edition for patreons of the website, allowing them the choice of a variety of colours, and with their yog-sothoth.com membership number individually stamped on the back as a unique and personalised identifier.
This is one of my favourite notebooks (only eclipsed by my Midori Traveller's notebook), and is currently being used for keeping notes relating to various boardgaming and rpg activities.
If you are not a patreon of the website or missed the limited run, a standard edition of the notebook is available in green leather - although you may have to sign up for free for membership of the site first). Purchasing one is definitely a fantastic way to support the content which the good folk over at YSDC regularly produce for the Lovecraftian community.