Buick? Whatever it was, it must have been mighty fast.
Looks like a touring rear seat lowered, modified, and moved forward. Interesting car! I would love to have it just how it sits there.
The radiator does look Buick-ish? Circa 1910 or a bit earlier? Hood and cowl do not look Buick to me. Chassis I am not sure. It looks as if there may be a transaxle under there.
Drive carefully, and enjoy, W2