According to the Swedish Death Index 1901 - 2009 Nils Olof Bergqvist was unmarried. A marriage has
https://sok.riksarkivet.se/bildvisning/00084698_00051#?c=&m=&s=&cv=50&xywh=3047%2C2559%2C2328%2C1473
It is down on line 20 with all the colorful check marks. Thank you for your help.
There is a death record in the Netherlands as well as Sweden, with the same date.
答え
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I'm not sure of the whole note, but it mentions a type of certificate 1620/8 (possibly implying a date, possibly a record number) for [I think] a giftermål (marriage ceremony) for him and the Dutch woman Eva Elsingen in Rotterdam, who it says was born on 21 Dec 1889 in Wolvega (in Friesland in the Netherlands).
I found a listing for Eva on WieWasWie (linked):
Child: Eva Elsinga
Born: 21 Dec 1889
Gender: Female
Father: Geert Elsinga
Mother: Aleida Oord
Document type: civil birth record
Heritage institution: AlleFriezen (a website)
Place setting: Leeuwarden (you could try contacting the Leeuwarden historical centrum via https://historischcentrumleeuwarden.nl/over-ons/e-mail-2)
Collection region: Friesland
Archive: 30-41
Registration number: 1051
Act number: 0445
Registration date: 21-12-1889
Place: Weststellingwerf
Collection: Archive name: Burgerlijke Stand Weststellingwerf - Tresoar, source: book, Deel: 1051, Period: 1889
Book: Birth register 1889
Note: The municipality of Weststellingwerf is not yet involved in Alle Friezen. This means there are no scans of the birth records.
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Thank you so much for your help! The Swedish Death Index must be incorrect. Thanks again. Rebecca
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