Famine beat me to it. I did league bowling as a teenager, so I've got a little aptitude for it. The ball would be around the 8lb. mark with custom drilled holes for that type of rotation to be developed, combined with the RPM generated by the bowler and the particular oiling of that lane (it makes a huge difference when a lane is only 1/2 or 3/4 oiled compared to the full strip!!).
And yeah, that's shot definitely looks real, I've seen the ball worse spin than that with an 8lb. house ball from other league bowlers that were in a tantrum mood and wanted to destroy stuff.