wmarucha99, please sign all posts with your first name plus an initial as we all do. To answer your questions: It is normal to have one MEKUGI in a blade's NAKAGO, when it is a traditionally made blade. Older blades can have several MEKUGI-ANA. Your blade, by the way, does not necessarily look like a war-time blade, but could be older. To make a safer assessment, we would need a number of detailed, well focused photos shot at right angle plus at least one of the entire blade (without HABAKI).. The TSUBA is a standard one, machine-made, nothing to be excited about. The same applies to the SEPPA (Japanese nouns do not have a plural form). Your blade being shorter than a KATANA (< 60,6 cm), is probably a WAKIZASHI, if it has a fully intact tip. Please refrain from all attempts of cleaning or restoring the blade. Nevertheless, you may apply a drop of machine oil to the NAKAGO to stop the red (active) rust. Have an expert have a look at the blade to see if it is perhaps a hand-forged blade of some age and value.