I've watched the British Pathe film, I'm pretty sure it is not a movie, but it actually shows some parts of '38 Mille Miglia. I suppose #30 could be the 508S or CS of Quintavalla, and I have an idea about the strange definition of #44. It could be a spider (perhaps with Zagato body) realized on a 508CMM base ( a berlinetta), and, as often happened, it might have manteined the 508cMM documents. So, when that car entered in the MM list, it was registered as a 1100 berlinetta even if it was already a spider.