First, welcome to the forum. Second, there is technically no such thing as a K98 bayonet although called that on ebay and by people who don`t know any better. Not slamming you for it by no means. I see you are here to learn. Third, there is a sub forum for bayonets, called Bayonets and Accessories, here. I would suggest posting your bayonet questions there in the future to get a timely response.
I will give some information here though. Your bayonet is known as an S84/98 III ( the III means type three). The type III was produced from 1934 to 1945. You can get more knowledge by reading sticky posts at top of posting list at sub forum and through the assorted posts there. Need to see better pic of grips before being able to tell you what you want to know. We need to be able to zoom in on them , can`t do that on the one you posted. Do not know what you should do different as I am not a picture taking expert. There are other members who can tell you what you should do if you ask. Try to take pics in better light. Outside a a cloudy day is the ideal lighting. Indoors by a window with indirect sun light passing through. There is also a sticky post on grip makers at bayonet sub forum that will tell you about the meanings of letters and numbers on inside of grip. I can tell you they are codes for the content/materials used in manufacture and code for maker of grip.
A double date S84/98 III will have two different years of manufacture date stamped on it. As in the case of a double date 43/44 asw ( E.u.F. Horster) the blade will have the year of manufacture date of 43 stamped on it and the scabbard will have the year manufacture date of 44 stamped on it. What happened is there were 1943 blades left over and used in the 1944 production. There are other double date bayonets from other makers but not getting that deep here.
Go check this sight out to see S84/98 III bayonets from every year and every maker.
http://k98.free.fr/
A word of advice, do not attempt to clean your bayonet before learning the proper way. A lot of bayonets are ruined by new owners who want to make them look better. Never use steel wool , a wire brush, sand paper or chemicals on it. Usually a light gun oil and clean cloth will suffice. If more is needed done to remove rust, ask what to do on the bayonet sub forum. I ( as well as other members) have made several posts about it.
I hope you stick around and learn about the S84/98 III and collecting them. It can be a very addictive hobby.