Browsing through my new books on succulents ("The Timberland Press Guide to Succulent Plants of the World", Fred Dortot, and "Succulents: The Illustrated Dictionary" + "Succulents II: The New Illustrated Dictionary", Maurizio Sajeva & Mariangela Costanzo) I have come to the conclusion that what I always thought was some kind of
Kalanchoe is, in fact,
Cotyledon tomentosa subsp
tomentosa. (Sent posting to "ID" topic for confirmation).
Whatever the plant is, it is flowering now on my balcony.