the Diamond Razor Co. was one of many American manufacturers producing straight razors during the late 19th and early 20th centuries. Boston, Massachusetts, was a hub for manufacturing and trade during this period, and many companies established themselves there. The phrase "Extra Hollow Ground" refers to the blade's curvature, which was a desirable feature for a close shave.
"Fully Warranted" was a common marketing claim, indicating the manufacturers confidence in the quality and durability of their product.
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