The seam on this bottle appears to go to about 1 inch above the top of the ribs.  Nothing appears at the top or above that the seam that shows 1" above the ribs.   This bottle is not in the cathedral style as they were much earlier, which would have had a broken pontil in the earliest bottles.  There are raised numbers "2931" on the base.  Shape of the base is actually not an oval, but a marquise shape.

Antique pepper sauce (peppersauce) bottles, popular from the mid-19th century onward, were initially made by hand in distinctive shapes like the "Gothic" or "cathedral" design, which featured "church window"-like panels. The rise of commercial sauce production, like Edmund McIlhenny's Tabasco in 1868, led to both hand-crafted and later machine-molded bottles designed specifically for the product. Early bottles were often repurposed, but later they were manufactured with custom molds to create brand-recognizable containers, many featuring pontil scars on the base, indicating their handmade origin. 

Early history and production

• Pre-commercial era: Before commercial bottling, peppersauce was sometimes stored in simple glazed pottery or reused bottles, such as old cologne bottles, as was the case with early Tabasco.
• Advent of commercialization: As pepper sauce became more popular, commercial bottle manufacturers began creating distinctive shapes for various sauces, including pepper sauce.
• Hand-blown process: Many early bottles were made using the hand-blown process, where a glassmaker would use a long rod called a pontil to blow glass into a mold.
• Pontil scars: A pontil scar is a rough mark left on the base of the bottle where it was broken from the pontil rod. The presence of this scar is a key indicator of an early, handmade bottle.
• Mold-blown process: Over time, bottles were made using multi-part molds (often wood), with some being dip-molded. 

Bottle styles and design

• "Gothic" or "cathedral" style: A very popular 19th-century style, these bottles have a unique, multi-paneled "church window" design and often have a hexagonal or octagonal shape.
• "Cathedral" vs. "Gothic": While modern collectors often call this style "cathedral," glassmakers originally referred to it as "Gothic," reflecting the Gothic Revival architectural period of the time.
• Cylindrical bottles: Smaller, cylindrical-shaped bottles were also made and were commonly carried by soldiers during the Civil War.
• Later designs: As technology advanced, bottles began to be made with smooth bases and seams that went all the way over the lip, indicating a shift to automated production, likely starting around the late 1880s or 1890s. 

Identifying age

• Seam placement: A lower seam on the bottle indicates an older, more handmade piece, while a seam that goes all the way over the lip suggests a bottle made with an automatic machine, usually from 1918 onward.