The Qualcomm Snapdragon 430-powered Sony Xperia R1 and R1 Plus are two budget-friendly handsets that remain exclusively available in India for now, being launched back in November 2017. Back then, both arrived with Android 7.1 Nougat onboard. Although the update to Oreo has been announced by Sony Xperia India on Twitter, there is no official information about the build number and the security patch date available yet.
https://www.notebookcheck.net/Sony-Xperia-R1-and-R1-Plus-receive-Android-Oreo.289084.0.html