While looking through the family archives I stumbled across my great great grandfather's cap & ball Remington revolver. I believe it is a model 1858. The loading lever functions but the cylinder will not turn and I don't want to force it. I plan on removing the grips and soaking the whole thing in penetrating oil (break free) for several days. I certainly don't want to shoot it, just remove any surface rust and get the cylinder to move freely. After removing the grips I found that the frame is stamped 42xxx. Can anyone tell from the picture if it is in fact an 1858 and if so the date of manufacture judging by the serial#? Thanks in advance for any help.