Jan 23 (Reuters) - PTB Group Ltd PTB.AX -
* Sees profit before tax for six months ended 31 December 2016 to be $1.9mln
* Upgraded forecast was driven by better than expected trading results across group particularly in dec
* Full year forecast remains unchanged at $4.0m - $4.3m Source text for Eikon: ID:nASXWGd5Z Further company coverage: PTB.AX