Hello, 91 Schichau as “torpediniere costiere di 2^ classe” (2nd class coastal torpedo boats) saw service with Regia Marina, identified as 56Sχ75S and 84Sχ154S.
For those listed in your message, the main dates are given below
• 56S (shipyard Schichau Elbing) delivered 13/09/1886, sunk 27/11/1886, collision with similar 57S in Gulf of Gascony
• 60S (shipyard Pattison Napoli) delivered 10/05/1888, stricken off 10/04/1913
• 61S (shipyard Pattison Napoli) delivered 1/10/1888, stricken off 7/09/1910
• 63S (shipyard Pattison Napoli) delivered 10/11/1888, stricken off 12/08/1910
• 64S (shipyard Pattison Napoli) delivered 1/05/1889, stricken off 14/04/1910
• 65S (shipyard Pattison Napoli) delivered 16/07/1889, stricken off 18/06/1911
• 66S (shipyard Guppy Napoli)delivered 10/11/1888, stricken off 15/08/1905
• 67S (shipyard Guppy Napoli) delivered 18/12/1888, stricken off 15/08/1905
• 68S (shipyard Cravero Genova) delivered 16/10/1888, stricken off 1/07/1919
• 69S (shipyard Cravero Genova) delivered 15/09/1888, stricken off 15/08/1905
• 70S (shipyard Cravero Genova) delivered 1/11/1888, stricken off 9/05/1907
• 71S (shipyard Cravero Genova) delivered 16/09/1888, stricken off 11/10/1907
• 72S (shipyard Odero Sestri) delivered 1/10/1888, stricken off 15/08/1905
• 73S (shipyard Odero Sestri) delivered 1/12/1888, stricken off 21/10/1910
• 74S (shipyard Odero Sestri) delivered 1/12/1888, stricken off 15/08/1905
• 75S (shipyard Odero Sestri) delivered 1/12/1888, stricken off 10/11/1910
• 86S (shipyard Ansaldo Sanpierdarena) delivered 1/10/1888, stricken off 10/03/1907
• 87S (shipyard Ansaldo Sanpierdarena) delivered 6/12/1888, stricken off 10/03/1907
• 88S (shipyard Ansaldo Sanpierdarena) delivered 23/11/1888, stricken off 11/12/1915
• 89S (shipyard Ansaldo Sanpierdarena) delivered 21/01/1889, stricken off 15/01/1911
• 90S (shipyard Ansaldo Sanpierdarena) delivered 1/12/1888, stricken off 16/10/1913
• 91S (shipyard Ansaldo Sanpierdarena) delivered 1/08/1889, stricken off 31/07/1911
• 92S (shipyard Ansaldo Sanpierdarena) delivered 18/03/1889, stricken off 10/03/1907
• 93S (shipyard Odero Sestri) delivered 1/10/1888, stricken off 15/08/1905
• 94S (shipyard Odero Sestri) delivered 11/03/1888, stricken off 15/08/1905
• 95S (shipyard Odero Sestri) delivered 6/03/1888, stricken off 1/05/1911
• 96S (shipyard Odero Sestri) delivered 12/07/1888, stricken off 25/07/1904
• 97S (shipyard Odero Sestri) delivered 14/06/1888, stricken off 25/07/1904
• 98S (shipyard Odero Sestri) delivered 12/07/1888, stricken off 7/06/1914 -

Hope this helps

fabrizio