Posted: Saturday, July 7, 2012 --- 1:53p.m.

PESHTIGO, Wis. (AP) -- Investigators are trying to determine whether a gun found in the sediment of the Peshtigo River might be linked to a Peshtigo bank robbery more than 50 years ago.

The gun was found last week in the riverbed, which has been exposed during work on a dam. Local residents discovered what officials believe is a .22-caliber handgun buried in the sediment.

Peshtigo Mayor Al Krizenesky says it's possible the gun was used in a 1956 heist when two robbers made off with more than $1,000 from the Peshtigo National Bank.

Krizenesky hopes a serial number can help authorities officially link the gun to the robbery.

A WLUK-TV report (http://bit.ly/LVmuMX ) says once all the questions are resolved, city officials hope to display the rusted gun at the city's historical museum.

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Information from: WLUK-TV, http://www.fox11online.com

Copyright 2012. The Associated Press.