Hi Craig:
According to the "American Truck Spotter's Guide 1920-1970" by Tad Burness......
1928 White Urban Delivery Truck. Not totally sure of the Model, either a 15B or a 57 and I rather think the 15B.
A remark for the photo mentions "special hood louvres" and this is what fooled me. If you are familiar with the
1927 Stutz, the Blackhawk at least had almost identical louvres.