I don't know for certainty no, I deduced that was the latest date they could be from the selection of films available. I would have put them earlier myself, as all the Dolcis footwear I've had from the early 60's are no longer 100% leather, but I suspect being made in Italy was the reason for this. Also the image most closely resembled Liz Taylor rather than any other Cleopatra. The film was in production for a long time so if you think they were producing memorabilia prior to the release they could well be earlier.
Now that you say it - the filming began in London 1960 and was moved to Rome after 6 months, so presumably they were made between then and the release.