Based on the search results, the Huawei Watch GT 3 46mm in Black for R3699 seems like a great value second-hand smartwatch option for you. As the most affordable model in the list, it still has all the core smartwatch features like activity/health tracking at a lower price point. The 46mm size offers a large and clear display. While I don't have specific second-hand listings, many customers enjoy Huawei watches and this could be a good value used purchase. Please let me know if you need any other details!
