in the sbconsole, click on About Service Bus: OSB 11.1.1.5.0:
Oracle Service Bus 11.1 Wed Apr 20 04:25:20 EDT 2011 1400736. Oracle Service Bus 11gR1 Copyright © 2004, 2011
OSB 11.1.1.7.0:
Oracle Service Bus 11.1 Fri Mar 8 04:05:15 PST 2013 1514631. Oracle Service Bus 11gR1 Copyright © 2004, 2013
Oracle Service Bus 11.1 Wed Apr 20 04:25:20 EDT 2011 1400736. Oracle Service Bus 11gR1 Copyright © 2004, 2011
OSB 11.1.1.7.0:
Oracle Service Bus 11.1 Fri Mar 8 04:05:15 PST 2013 1514631. Oracle Service Bus 11gR1 Copyright © 2004, 2013