In the April 1910 auction catalogue of the Stroganoff Collection (discussed in a recent post here), most of the descriptions are too imprecise or generic to make recognition possible, e.g. lot 614, an unidentified 15th-century Florentine half-length bishop-saint:
"D. Ritaglio di corale; effige di Santo Vescovo a mezzo
busto. Arte F[i]orentina secolo xv."
A few others describe more distinctive features, however, and I have therefore been able to identify a couple, and can thus add some previously unknown, or at least forgotten, provenance to them.