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This tends to protect the use of these marks, and in general restricts them to use on pieces made in the UK.
The second is worn out by the gold layer but can only be 119708/17.
An item with a registry mark or number could have been produced before (less likely as the design would not be protected), or after the date of the registry mark.
The number listed for each year in the table is the first number issued that year. If your number is higher, but less than the number for the next year, then your item had it's design registered during that year.
These were published weekly, and bound into hard bound volumes by the year.
By the later part of the 19th century, it required anywhere from two to four volumes to list and describe all of the issuances for a given year.