January 21 (SeeNews) - Croatian telco Hrvatski Telekom [ZSE:HT] said that together with lender Zagrebacka Banka [ZSE:ZABA] it signed on Friday a deal to sell their combined 54.31% stake in fixed internet and pay-TV services provider OT-Optima Telekom [ZSE:OPTE] to Telemach Hrvatska, the local unit of Dutch multi-play and media provider United Group.