In most cases, one- or two-digit numbers are actually mold numbers that indicate the specific bottle mold or section in an automatic bottle machine. If numerous molds were identical, each one received its own number. Base numbers also indicate bottle styles or shapes, manufacturing dates, or factory location codes.
There are three keys to help with dating most bottles:Side seams: None: bottle may be free blown, in which case it has a very uneven shape and dates before 1860. Base type (for examples, click here): Open pontilled: usually date before 1860. Top type (for examples, see click here):
Grolsch Brewery (Koninklijke Grolsch N.V. - "Royal Grolsch"), known simply as Grolsch (Dutch pronunciation: [ɣrɔls]), is a Dutch brewery founded in 1615 by Willem Neerfeldt in Groenlo. In 1895 the de Groen family bought the brewery.
Case of 12 Grolsch-style swing top beer bottles with ceramic caps. These bottles are perfect for storing: beer, kombucha, soda, condiments, sauces, kefir and more. Each ceramic cap includes a silicone gasket which reduces the risk of leaks, providing maximum seal.