Size 6. Looks to be made from a steel pipe - fits about a size 6. Extremely wide band - 1/2" wide at back and nearly 7/8" at front (unengraved signet part). The front and interior look almost unfinished, like the serviceman who made it didn't complete the polishing step. It seems he had access to tools/some kind of machine shop. You can see wide sweeping scratches where a tool was used to flatten the front. WW2.