Company Names, addresses, dates:
Williams, Washington DC
Williams does not appear in any Washington DC city directories.
I cannot find proof of this, but I suspect that the bottle below embossed with "Williams" was from a company owned by Wash B. Williams. A July 25, 1937 article in the Washington Post said that Mr. Wash B. Williams had just accepted a Dr. Pepper franchise, but it also said that he had opened a bottling plant 2 years earlier. So my guess is that his bottling plant opened about 1935 and started producing soda in bottles like the one shown in the table below; then in 1937 he started producing Dr. Pepper using bottles embossed with "Dr Pepper".
book # 724
This is a wavy-textured clear 8" crown top bottle embossed:
base: WILLIAMS / 6 1/2 FL OZ / WASHINGTON DC