As far as I can work out from the picture it has no "MICROTOR" typing. Is that possible for a 20357/215?
I thought the lower text was microtor. If not - bumper SS138. Very interesting... Does it say polarouter or polerouter?
Thin or fat indexes on the bezel...Or? https://omegaforums.net/threads/early-polarouter-back-from-spa.36831/#post-422292
Could be a horrid redial for what I know. I was also thinking 138SS at first. From what I can see the SWISS (or SWISS T?) printing is in between the minute track and bezel. I also suspect the indexes to be of the thin type. Fortunately not too much invested, but I sense it is a 138SS inside.
Does that have a name or reference #? I recently bought the Oris BC3 because I wanted something with arabics on the dial. This would also fit the bill.
Another Seamaster 30 Calibre 286 Original crown Gold font Seamaster 30 script Case seems to have been polished Could probably stand a light rub ?