I recall when Monty Panesar played for Bexhill in The SCL. He obviously did great things with the ball (17 wickets at 11.76 in 3 games) but also scored 2 half centuries with the bat going in at No.3
Only instance I can find recently (there may be others though) is Mathew Hayden scored 119 in an innings & 198 runs win for Australia v Pakistan in Sharjah in 2002. Pakistan scored 59 all out in their first innings and 53 in their second...