This bicycle appears to be much older than 1985. The head badge and Tange tubing sticker are both representative of the 1970s. By 1985 I would also have expected a set of bottle bosses on a LeMans. The presence of a dropout with integral derialleur hanger would suggest it was orignally intended for a derailleur. These dropouts, in conjunction with other features, would place it late 1970s.

Of course, that is based on North American models. Some discrepancies could be due solely to the market. If it is from the era I suspect, the serial number may be located on the lower seat tube and consist of a letter and three numbers. It would also be intertesting to check the date codes on the components you suspect to be original.