Thanks for the details, as You could see we asked this picture, because there are no serial numbers, but assembly numbers typical for the bayonet producer for the lock nut, the grips as You could see are dyed only on obverse surface, this is not typical for german production, so its very possible the light color wood of grips that is clear visible on the previous pictures were later dyed to dark.The finish is typical for middle -late war period and the finish under grips is dull blued not phosphate, as there are many different pictures, i only could say that the finish on blade of 1237 is probably origin, the overall piece should be cleaned in alcohol and then oiled by gunoil and made a picture on sunlight.