As omitting a leading/first digit is common, and it's always the first digit, and always "1". Now, the rest three digits are in the center of a shape: "1", "2", and... "0", which also can be 5, as Arabic circle is "5" (the dot is "0"). It's hard to tell whether the dot or circle is depicted. I actually think it's a circle, hence 125, but it does not make much difference
, and I think that the shape under that circle is decoration, not a digit. Hope I make any sense, Rand:-)
Here is another example: at the very bottom, where the gold is washed away, the date reads 113, i.e. 1113 = 1701 (just one year short of 17th Century:-)