As you can see, there are 3 comma-separated tokens in that string.
The 1st token is the font name (who would have guessed?)
The 2nd token contains the font size (2nd digit and onwards) and whether the font is bold (1st digit) information: the 4 in 411 means the font is not bold. If it was bold, this would be 711. 11 is the font size, as returned by $window().fontsize. The first digit can only be 4 or 7 in mirc.
The 3rd token is more mysterious. It represents the "Script" setting in the Font dialog, ie the selected character set. The available character sets and their equivalent numbers can be found here
. The number in the 2nd column in that table (Code (dec)) is exactly this 3rd token.