1673/1674
For 1673/1674 the key weeks and dates were:
Week 1:16 December to 23 December 1673
New Year 1674, Week 3: 30 December to 6 January 1674
Legal New Year, Week 15: 24 March to 31 March 1674
Week 52: 8 December to 15 December 1674
1674-24 is missing.
