DIAMOND OVAL (OMN) by Richards & Hartley Glass Company (Pittsburgh/Tarentum-PA, Operated: 1865-1891), c. 1890
Sid Lethbridge: the date should be c1890 but likely was well before then.
image 1 of 2

Shape: Catalog Cut/Ad/Comparison Charts
Contributor: Debi Raitz

Shape: Salts, open
Contributor: Robert Wilkin