German ring Westwall was found near village Svetliy (former Zimmerbude), Kaliningrad region, Russia. Due to the fact that the ring is deformed, it is impossible to know the inner diameter.
— 10 USD by Russian Post
— 25-40 USD by courier service EMS
— 30-40 USD by Russian Post
— 40-60 USD (depends on customer's country) by courier service EMS
What is the difference between Russian Post and EMS courier service? Read here - link