As you have already figured out, your Type 30 bayonet was made by Matshusita. This is a fairly late-war example. This would have been an 88th or 89th series piece, the 89th series being the last run of bayonets made by Matshusita. The series marks are on the pommel, along with the number you found. It is rare that one can state with any certainty that a Type 30 bayonet and scabbard are an original pair. However, this scabbard is most likely original to the bayonet. It is unique in having thicker string ties than other wooden scabbards. Compare yours to the wooden scabbard pics on my site (url below). The thick string is indicative of Matshusita manufacture.
Give the bayonet a light cleaning with superfine (0000) steel wool saturated in oil. This will remove any loose scale and stop further rusting. It would also be OK to go over the blade with acetone, lacquer thinner, etc. to try and remove the white paint. Just be sure to re-oil afterwards, so it doesn't start rusting. The scabbard is obviously quite dry and the string is likely pretty fragile. It's probably best to leave as is. If you are really careful, you may be able to chip some of the paint off with a fingernail.
Substitute-standard Type 99 rifles are quite common (as are the bayonets). You shouldn't have too much difficulty locating one at a reasonable price to go with your bayonet.
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The bayonet cannot be abolished for the reason, if for no other, that it is the sole and exclusive embodiment of that willpower which, alone, both in war and everyday life, attains its object.—General M. I. Dragomirov
Last edited by marysdad; 06-07-2009 at 04:40 AM.