RIBBED ACORN (AKA) by Cape Cod Glass Works (Sandwich-MA, Operated: 1858-1869), 1860s
Sid Lethbridge - the OMN is likely No. 31 Acorn (vine).
NOTE: Bill Morrison: There is a group of these low compotes/bowl on base that are all related. There is this one (ribbed acorn), bellflower and ribbed grape. All have the same ribs, measurements and profile and the bellflower and grape also have the bellflower base.
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Shape: Butter, Cheese, & Honey Dishes
Contributor: Liz Roach

Shape: Lamp and Lamp Shades
Contributor: Terry Clarke early kerosene burner with Oregon shade

Shape: Lamp and Lamp Shades
Contributor: Hawk Jackson restored with period burner

Shape: Lamp and Lamp Shades
Contributor: Hawk Jackson Bellflower (L) and Ribbed Acorn (R)

Shape: Assortments
Contributor: Liz Roach collection 2020

Shape: Comport/Compotes
Contributor: Margaret Malloy

Shape: Lamp and Lamp Shades
Contributor: Liz Roach 8H

Shape: Comport/Compotes
Contributor: Liz Roach covered sweetmeat 7H

Shape: Footed Bowls/Low Comports
Contributor: Anthony Charles Stringfellow 6D overall height 5.5

Shape: Footed Bowls/Low Comports
Contributor: Anthony Charles Stringfellow 6D overall height 5.5

Shape: Footed Bowls/Low Comports
Contributor: Anthony Charles Stringfellow 6D overall height 5.5

Shape: Bowls & Berry Sets
Contributor: Liz Roach nappies 4D and 3.25D

Shape: Comport/Compotes
Contributor: Sid Lethbridge

Shape: Collections
Contributor: Liz Roach