You posted an illustration of Guidicini here Gene
https://www.doublegunshop.com/forums/ubbthreads.php?ubb=showflat&Number=617038&page=4

He won in 1883 and again in 1890
https://books.google.com/books?id=Vmg9AAAAYAAJ&pg=PA62&lpg

Gran Prix du Casino
1882 – George Lorillard, New York
1883 – H.J. Roberts
1884 – H.R.H. Comte de Montecupo
1885 – M. De Dorlodot
1886 – S. Guidicini
1887 – Comte Salina
1888 – not recorded
1889 – V. Dicks
1890 – S. Guidicini
1891 – Count Luca Cajoli
1892 – Count Trauttsmandorff

Prix de Monte Carlo
1883 – S. Guidicini

https://sites.google.com/a/damascusknowledge.com/www/home