Upvote:5
Vid means widow. Reference. The date 1949 is probably when the relic was last verified and sealed.
St Margaret may well be St Margaret of Scotland. But there are a number of other candidates — Wikipedia lists the following, and there may well be more:
Saint Margaret the Virgin of Antioch (died 304) [unlikely, since widow is stated!]
Saint Margaret of Scotland (c. 1045–1093) [widowed]
Saint Margaret of England (died 1192) [never married; a nun]
Saint Margaret of Hungary (1242–1271) [never married; a nun]
Saint Margaret of Cortona (1247–1297) [never married]
Saint Margaret the Barefooted (1325–1395) [widowed]
Saint Rita of Cascia (1381–1457) [widowed]
Saint Margaret Clitherow (1556–1586) [married but not widowed]
Saint Margaret Ward (died 1588) [no marriage recorded]
Saint Marguerite Marie Alacoque (1647–1690) [never married; a nun]
Saint Teresa Margaret of the Sacred Heart (1747–1770) [never married; a nun]
You don't say what the relic is, but St Margaret of Scotland is certainly the best-known widow of that name. If the seal is identifiable, then there may be records available (for which the date and serial number will be useful).