Just comparing their models and it looks like the 60 series is 2.1m high and the 58 series is 1.92m high, so that explains the numbering system.
However, does anyone know if Samsung are going a bit stale in the home appliance market, as even when display their newest models on their website and then searching for them online, it either yields no results, suppliers that have no stock, or most worryingly that they've been discontinued.
I don't want to spend upwards of £600 on an appliance only to find it's either very last of the stock or going to be obsolete very soon!