HELM <H> SELLS ADDITIONAL SHARES IN BAMBERGER Helm Resources Inc said that, pursuant to the exercise of an overallotment option by underwriters in Bamberger Polymers INc's initial public offering, it has sold another 35,000 Bamberger shares and reduced its ownership in Bamberger to 51 pct from 55 pct. To date, Helm has sold 435,000 Bamberger's for 3.5 mln dlrs. Bamberger has sold a total of 600,000 shares and received net proceeds of about 4.8 mln dlrs since the February 1987 offering.