gilbert font. also, is the underline a feature or something of the font or is it like a letter then used to make such line.

Ballpark Weiner  Suggested by pilaster 

Swash isn't a part of Ballpark, but here's a similar from another…
http://www.dafont.com/angilla-tattoo.font?text=3&psize=l&back=author
http://www.dafont.com/hemmet.font?fpp=500&psize=l&text=3