Older styles include: In the United Kingdom, draught beer must be sold in Imperial measure (see Pint § Effects of metrication).
The number etched upon the glasses stands for the manufacturing company or site.
Most pint glasses used in the United Kingdom today have actually been produced in France.
Under the EU Measuring Instruments Directive (Directive 2004/22/EC), the certification of measuring instruments and devices used in trade (including beer mugs, weighbridges, petrol pumps and the like) can be done by third parties anywhere within the EU with governments taking "only the legislative and enforcement (market surveillance) functions" and "ensuring that the system of third party assessment ...
has sufficient technical competence and independence" (or, in simple language, calibration services were privatised).
Glasses that have been certified by authorised firms anywhere within the EU have the letters CE etched on with the certifying agency's identification number.
Conservatives campaigning to have dual markings of crown and CE were informed by EU Commissioner Günter Verheugen that "a Crown stamp look-alike could naturally be affixed to the glass, as long as it is done in such a way that it is not confused with the CE marking".
Selling beer in unmeasured glasses without using some other form of calibrated measure is illegal.
A pint glass is a form of drinkware made to hold either a British ("imperial") pint of 20 imperial fluid ounces (568 ml) or an American pint of 16 US fluid ounces (473 ml).
These glasses are typically used to serve beer, and also often for cider.
Pint glasses became popular in the United Kingdom in the early/mid-20th century, replacing tankards (pewter, ceramic, and glass).
This change is notably lamented by George Orwell in his 1946 essay "The Moon Under Water".