J. Wiss & Sons Co. of Newark was host last night at a party marking the company's 100th anniversary. More than 1,200 employees and guests attended the affair, held at the Mosque terrace ballroom.

Gold watches were given to 117 employees who have worked for the company 25 years or more. After a dinner, there was a floor show and dancing. J. Robert Wiss and Norman F. Wiss, grandsons of Jacob Wiss, the founder, are president and vice president-treasurer, respectively, of the company.