There were two things about the car that made me think "Maser"...one was the overall proportions of the car. It seemed a little too small to be an 8C (even though there are 8Cs with similar body work) and, well, yeah, that is definitely a Maserati badge on the grille shell there. You can tell by the proportions and the colors.
I suppose there's a chance that it's a rebodied 1500 Alfa but I imagine if the people at Kruse turn up a record of the car it will point towards the car being 1123 or one of its kin.
Regardless, thanks for posting that photo; great to see a car in that condition.