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How many working days in year 1921?
Here is the detail of the calculation:
Because 1921 is not a leap year, it has 365 days.
Let's remove 53 saturdays and 52 sundays. It remains 260 days.
Now, let's remove 9 public holidays that do not fall during a weekend and we obtain 251 working days in 1921.
 Here is the list of these 9 public holidays: 
 
 1. Epifania : Thursday, 6 January, 1921 
2. Lunedì di Pasqua : Monday, 28 March, 1921 
3. Anniversario Liberazione : Monday, 25 April, 1921 
4. Festa della Repubblica Italia : Thursday, 2 June, 1921 
5. Festa di San Pietro e Paolo : Wednesday, 29 June, 1921 
6. Ferragosto o Assunzione : Monday, 15 August, 1921 
7. Ognissanti o Tutti i Santi : Tuesday, 1 November, 1921 
8. Immacolata Concezione : Thursday, 8 December, 1921 
9. Santo Stefano : Monday, 26 December, 1921 
And here are the 3 public holidays falling on a weekend:
1. Capodanno : Saturday, 1 January, 1921 
2. Festa del lavoro : Sunday, 1 May, 1921 
3. Santo Natale : Sunday, 25 December, 1921