I pulled the radiator on our 1914 Touring today on my way to pulling the head. I observed a serial number that I had never seen before on the back side of the upper tank. I've done a little looking to see if there is any information on brass radiator serial numbers and production years and found none. The number is 1277155. Does a reference for this exist? I'm only aware of lists for engine numbers, frame or body numbers. Our 1914, has an "original" block # 381363, body # W 14 184399.
Here's a photo of the serial number on the radiator.