Gordmans Stores, an off-price department store chain operating 67 stores in the Midwest, filed on Friday with the SEC to raise up to $75 million in an initial public offering. The Omaha, NE-based company, which was founded in 1915 and booked $458 million in sales for the year ended January 2010, plans to list on the NASDAQ under the symbol GMAN. Piper Jaffray is the lead underwriter on the deal, for which pricing terms and timing were not disclosed.