The Cultivated Italian (or) who Reminded Freud How to Remember Signorelli?

In a letter to Fliess, dated 22 September 1898, Freud wrote that:

A second example of name forgetting resolved itself even more easily. I could not find the name of the renowned painter who did the Last Judgement in Orvieto, the greatest I have seen so far. Instead, Botticelli, Boltraffio, occurred to me; but I was sure these were wrong. At last I found out the name. Sienorelli, and immediately knew, on my own, the first name Luca - as proof that it has been only a repression and not genuine forgetting. (Masson 1985, pp. 326-7, emphasis mine)

Five days later Freud informed Fliess he had ‘turned Signorelli into a little essay’ and had ‘sent’ it to Ziehen (Masson 1985, p. 328) editor of the Monatsschrift fur Psychiatrie and Neurologie. Ziehen accepted the paper in early October (Masson 1985, p. 331) whereupon it was published in December 1898 under the title Zum Psychischen Mechanismus Der Vergesslichkeit - ‘The Psychical Mechanism of Forgetfulness’ (Freud 1898). ‘This was the first published history of a parapraxis, and Freud made it the basis of the opening chapter’ of The Psychopathology of Everyday Life published three years later in 1901 (Strachey 1962, p. 288).

Now in that same 22 September letter to Fliess Freud wrote:

I lost the name of Signorelli during a short trip to Herzegovina, which I made from Ragusa with a lawyer from Berlin (Freyhau) with whom I got talking about pictures. (Masson 1985, p. 327, emphasis mine)

From the Fliess correspondence we know Freud left Aussee ‘with Martha for the Adriatic’ on Wednesday 31 August 1898 (Masson 1985, p. 325). From subsequent sources we know they then travelled together to Ragusa (later Dubrovnik). After a ‘few days in Ragusa’ (Freud 1898, p. 293), while Martha was ill with ‘some gastric disturbances’ (Jones 1954, p. 369), Freud ‘went for a carriage drive… to a town nearby in Herzegovina’. It was during that outward