Compared to the caligae finds from north of the Alps, this is a rather different type. Ok, admittedly you have to be a bit into the details of this type of shoe to get excited about it,
but if you are you will recognize immediately that the heel area has a totally different design to it.
Interestingly the few finds of this type all come from Egypt, most prominently from Qasr Ibrim, which was occupied by the Romans until at least the end of the 1st century AD. European finds do not show such a high closed heel, nor do the feature embossed lines to decorate the upper with the exception of those from the Commachio wreck from Italy. One interpretation might be that this was to prevent dust and sand to easily enter the heel area, although how much this would help considering that the front half is pretty much like all other caligae (i.e. open low cut) would need to be put to the test.