Pretty sure that strap comes with the 1st gen galaxy watched 46mm.

here is an after market one: https://www.amazon.com/HSWAI-Compatible-Frontier-Silicone-Bracelet/dp/B07KC7L4L9/ref=sr_1_4?crid=27Y1W7AH2LJOV&keywords=22mm%2BSilicone%2BWrist%2BBand%2BStrap%2Bfor%2BSamsung%2BGalaxy%2BWatch%2B46mm%2BSM-R800%2BSmartwatch%2BReplacement%2BBracelet%2BWatchband%2BStrap&qid=1672789923&sprefix=%2Caps%2C948&sr=8-4&th=1