no markings newmodel revolver

[falcon45]

I was passed down what a 1858 model army but it has no markings on it. all the other guns I received were real. does anyone know anything? the gun was in the family since at least the 60's uncle collected civil war guns. There is a b on the trigger guard. Looks like its a new model but not sure front sight seems older style. Any help appreciated. OK More info just took grips off found a Z an E and the # 40126 found 40126 on trigger guard