Cool photo. I've never seen a windshield like that. Is this an export car?
I have seen a few like that. More in old photos than survivors. They must have made quite a lot of them. They were an after-market item. Both the top and the bottom swing for ventilation. I think a few variations on an idea were made by a few different companies.
Thanks Herb and Erik.
Drive carefully, and enjoy, W2
Note it has the brass trim - 1915 and the horn button on top of the steering column.
Hap l9l5 cut off
That is an accessory Rain-Vision windshield.
Rick is correct. Good work.