Good finds. The buckle is from La Pierre Manufacturing Company, founded as a small shop in 1888 in New York, NY and then became an incorporated business in Newark, NJ in 1895.
They used various styles of that ‘£’ mark and continued to do so after being acquired by the International Silver Company in 1929 and moved to Wallingford, Connecticut. I believe that particular style of mark was in use from incorporation until they were purchased by ISC (although the ‘£’ mark itself continued to be used thereafter)