This object is an 
Atterbury & Company milk glass master open salt cellar. 
Details
  • Manufacturer: The piece was made by Atterbury & Company, a Pittsburgh-based glassmaker that operated from the 1850s until 1900.
  • Pattern: It features the Basket pattern, also known as Atterbury's Basketweave.
  • Date: The pattern was introduced in 1874. The bottom of similar items is often embossed with patent dates, such as "pat June 30th '74" and "Mar 13th '75" (referring to 1874 and 1875).
  • Design: It is made of opaque white glass (milk glass) and has a scalloped rim, a basketweave body, a pedestal base, and two twisted rope-like handles.
  • Use: It was intended as an individual open salt dip dish or master salt cellar, a common item in the Early American Pattern Glass (EAPG) era.