L & H Stern (LHS) of Brooklyn, New York. The company’s famous logo is in a diamond. These pipes are high quality production pipes. The L&H Stern Inc. was established by Ludwig Stern (1877-1942) in 1911. His brother Hugo (1872-?) acted as vice-president & secretary. The firm moved to 56 Pearl St. Brooklyn in 1920. It closed down in the 1960s. LHS was one of the main pipe supplier for US soldiers during WWII.
In a 1944 catalog there were various model names made by LHS, and they included: Ultra Fine, Sterncrest, Certified Purex, Purex, a Patented Purex, Sculptured Purex, Purex Superfine And other line names: Barrister, Marwyn, Park Lane, Radmanol, and Warwick.
Many of their later Sterncrest pipes featured silver bands and some were made with 14kt. gold bands as well.
The "Diamond" series appears to be their high-end line. They had a different logo which was 3 diamonds in a row, larger in the middle. They also had Allbriar models (stem and bowl both made of briar) in the Diamond line, and these tended to have a screw type fitment with stinger, like Kaywoodie or Dr. Grabows.