Edward's pennies were minted to the same standard as the final Victorian issues: 95 percent copper, 4 percent tin and 1 percent zinc, and, like all bronze pennies from 1860 until 1970, they weigh an average of and have a diameter of 1.2 inches (30.81 mm). The head faces right on the Edward VII coins, with the inscription EDWARDVS VII DEI GRA BRITT OMN REX FID DEF IND IMP. The reverse shows the seated Britannia surrounded by ONE PENNY, with the date at the bottom of the coin; this design remained largely unchanged until the coin's demise after 1970. Pennies were struck with Edward's bust from 1902 to 1910. There are two varieties of 1902-dated pennies, "high tide" and "low tide", due to a decision to raise the apparent water level around Britannia.