Hello, New to muzzleloading and to this forum. I need some help. I have what appears to be a musket, as it is a smoothbore and looks to be around a 20 ga. diameter barrel. Only markings are Japan 614. Not sure of age, but I'd make a wild guess at about 50 yrs., plus or minus. No rear sight and a blade front sight. It does appear to have all of its parts, works (no flint), and it has an octagonal receiver and round barrel. There is a flash pan and a hole (1/16th?) off of that. Looks like it's never been fired(?) Question: safe to shoot or is it a replica? If shooter, how much powder? Might be able to send some pictures. Thanks!!