Police today were sifting the records of known jewel thieves as they pressed their hunt for the three bandits who held up the Wiss jewelry store at 665 Broad street Saturday and escaped with unset diamonds worth $50,000.

Apparently several isolated fingerprints found in the store were the only clews to the identity of the masked and armed trio who executed the holdup with the smoothness of professionals.

Police have sent copies of the fingerprints to the Federal Bureau of Investigation in Washington, where they will be checked against those of criminals specializing in jewel robberies.

Additional fingerprints also were reportedly obtained from an Oldsmobile sedan found Saturday night in Division street near Spring street by Detective Sergeant John Duhig and his roving squad.

The auto was stolen Saturday morning from John J. Fullam of 1715 Boulevard, North Bergen, and police believe it may have been the get-away car of the bandits.

Detectives were in North Bergen until early yesterday checking on the circumstances of the auto theft.

Bandit squad detectives, headed by Detective Captain McHugh and Lieutenant McMahon, also were checking on a deluge of tips turned in by persons who were in the vicinity of Wiss's at 9:30 A.M. when the bandits executed their well-staged coup.

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Some detectives were detailed to New York, where the gunmen's plot may have originated.

Meanwhile, specific descriptions of the gems were circulated among jewelers throughout this section of the country and the Jewelers' Security Association offered rewards for information leading to the arrest of the bandits.

Police were impressed with the smooth execution of the robbery. The bandits entered the store just as it opened, cowed some 20 employees with their revolvers, took the diamonds from an open display safe and fled at a time when the streets were relatively clear of policemen. Officers arrived at the scene only seconds after the escape of the robbers.