It is a 1957 for sure...
1) It is a red glass single shelf
2) With the serial number MV906, it was made well before existing 1957 Polars that I have.
Serial numbers alone are sometimes useful if you can place that number between other known serial numbers of identified bows.
As suggested in an earlier post by ceme24, I would suggest that the tips be replaced for the sake of safety as they are made of paper marcata. Fiberglass tips will be far more reliable and are easy to change as these are single layer tips.