UPDATE 3-Toyota could post 1st parent oper loss since founding

(Recasts, adds analyst and source comments, details)

TOKYO, Dec 19 (Reuters) - Toyota Motor Corp (7203.T) is likely to report its first annual parent-only operating loss since the company was founded more than 70 years ago, hit by plunging sales and the soaring yen, several Japanese media reported on Friday.

Toyota is set to issue a revision for its parent and consolidated forecasts at a year-end news conference on Monday, the Chunichi Shimbun and Kyodo news agency reported.

Toyota, the world's biggest automaker, last posted an operating loss in its first year of operation in 1937/38.

A Toyota spokeswoman declined to comment on the reports.

Toyota made a parent-only operating profit of 140 billion yen ($1.57 billion) in the first half after incurring currency losses of 300 billion yen, making a full-year loss at current exchange rates a near certainty.

Shares of Toyota were down a relatively tame 1 percent in morning trade, in line with the Nikkei average .N225, as conflicting reports emerged.

The Nikkei business daily predicted Toyota would also report a consolidated operating loss for the full year, while the Mainichi Shimbun newspaper said the company would not issue a profit warning this month.

The Nikkei this week incorrectly reported that Japan's No.2 automaker, Honda Motor Co (7267.T), would lower its annual operating profit forecast to about 300 billion yen, instead of the actual 180 billion yen.