I looked up the marriage between Lilly Axel and John J. Corper in the NY marriage index, and found this record.
The wedding occurred on Dec 25 1919, and was registered in early 1920.
I then ordered the microfilm for FHL roll #1644060 and looked up marriage certificate #1280, to discover that it listed the wrong couple. In fact, examining the dates on the certificates of film #1644060 suggests that it is from the beginning of 1921, not from 1920. Retroactively looking at the FHL listing for this film, it indeed shows that the roll contains certificates 501-1750 from 1921. The correct film (assuming the certificate number is right) seems to be 1643530.
- How common are such errors (off by a whole year!)?
- How trustworthy is the certificate number?
- What was the indexing process that led to such errors?
- What is the most effective way to notify IGG (the keepers of that database) to update it?