The pronunciation of these two forms would be very similar, if not the same, except for the suf. There is no evidence of a final waw here. This is a 3fs suf not a 3ms. Compare on page 35 for what must be a miniature notation. See other miniature notations described in introduction.
Further enlargement seems to make it appear more like a notation.
The note seems to start with a description of the mem the first two letters looking very much like he mem. The numeral 1 is added by me.