Not the first as used to time trains, but the first American watch designed and marketed especially as a railroad watch. American Watch Co Crescent Street 1870 model. Waltham was still producing the old 1857 model when this 15j new top of the line 18s was introduced in 1870. Mine was made in 1872, it is key wind and set, bouth from the back. Adjusted to temperature and positions. Total production of the 1870 Crescent Street keywind was 9900, and the price was US$50 in 1870. The design differs from the older 1857, it looks more like the 1877 and 1879 models that would follow. This watch is in a coin silver recase and needs a clean.