Pictured here are two line break insulators. These are an obscure style porcelain insulator that I collect. These come in many different sizes depending on the conductor wire size employed in the circuit. Most are unmarked but all the marked examples I have are Illinois porcelain marked with an ug ink stamp date and Illinois Porcelain state outline mark on the firing rest.
I have these in many sizes with various shades of tan thru light and dark brown with some more modern gray colors. These were used extensively during the WWII era on low voltage( 4KV) secondary circuits throughout Southern Oregon and there are still some in service today. Picture taken in Klamath Falls, Oregon in 2011