* Pound heads for largest weekly drop vs dollar since Oct. 2017
* Greenback steadies after two slippery weeks
* Graphic: World FX rates in 2019 http://tmsnrt.rs/2egbfVh
By Tom Westbrook and Stanley White
SYDNEY, Dec 20 (Reuters) - Sterling was precariously poised as it headed for its worst week in more than two years on Friday, hobbled by familiar fears of a chaotic British exit from the European Union, while firm data helped the dollar arrest its recent slide.
Overnight the pound GBP= slipped below $1.30 for the first time in a fortnight. It was last quoted at $1.3022 as worries grow about whether a deal can be secured before the December 2020 hard deadline.
Cable has given up all the gains won after Prime Minister Boris Johnson was re-elected last week and has slumped 2.3% against the dollar since Monday. It has fared even worse against the euro, headed for its largest weekly loss since July 2017. EURGBP= .
"The market was always a little bit naive in a way to think that a Tory election win was going to remove the fog of Brexit," said Ray Attrill, head of FX strategy at National Australia Bank. "There were obviously some longs in weak hands that got forced out."
More than three years since Britain voted to exit the European Union in a 2016 referendum, Johnson's government will leave the political bloc at the end of January and has set Dec. 2020 as a hard deadline to reach a trade agreement. over that prospect helped the safe-haven Swiss franc to its highest in a month against the euro at 1.0881 francs EURCHF=R and its strongest against the dollar since August CHF= .
Elsewhere, the greenback found broad support. Solid housing starts and firmer-than-expected manufacturing data this week helped to halt two weeks of declines against a basket of currencies .DXY . The dollar index rose slightly to 97.440.
Nobody expects the U.S. Federal Reserve to move interest rates anywhere when it meets in January. FEDWATCH
The dollar last traded a whisker stronger on the Japanese yen JPY= at 109.31 and a tiny bit weaker against the euro EUR= at $1.1116. The dollar has gained 0.7% on the yen this week.
The best performer of the last 24 hours has been the Australian dollar AUD=D3 , which rallied half a percent as strong jobs data prompted traders to pare back bets on a interest rate cut when the central bank meets in February. that the Reserve Bank of Australia will reduce rates fell from about 60% to just under even. 0#YIB
"That's a notable change. When you drop under 50% the psychology changes a little bit," said Westpac FX analyst Sean Callow. "I can see why people are not quite convinced," said Callow, who is sticking with a forecast for a cut.
The Aussie was last steady near a one-week high at $0.6883. The New Zealand dollar NZD=D3 was stable at $0.6607, in a week where weakness in milk prices was offset by another round of positive economic data.
The Chinese yuan CNH= held just on the strong side of the symbolic 7-per-dollar as China's unveiling of new tariff exemptions on U.S. chemical and oil product imports supported optimism about the Sino-U.S. trade detente. kept its lending benchmark rate unchanged on Friday, but markets widely expect further monetary easing in 2020 to arrest an economic slowdown.
The one-year loan prime rate (LPR) CNYLPR1Y=CFXS was unchanged at 4.15% from the previous monthly fixing. The five-year LPR CNYLPR5Y=CFXS also remained the same at 4.80%. Wednesday the People's Bank of China lowered rates on 14-day reverse repurchase agreements to ease monetary conditions.