To Fred P. no problem with no seeing the other eagle stamp as You were focused on the RZM stamp, You are experts on this, so i only waited who will answer it, certainly the Eagle M is nice and is bad that was damaged with a aditional SS stamp, that is max. 10 years old, through the die borders visible on frog.
To browning, certainly is hard word to word translate, as in original manual is used the czech or slovak word "hnedeni" which means a finish with brown color result, the solution was so mixed that the endproduct was not of blue color but more of brown color, they didnt different the various colours of finish, but the scabbard is clearly blued finish. So the blades on were used only other solution that dont realised the typical blue finish as seen on german items, but looks like matted only. The scabbard were blued in similar chemicals like german do.
To Your E/607 could be not fully finished as germans ordered a blued finish, so maybe the chemicals were not good already or the finish was not fullended. before the blueing was applied acid solvent to remove and clean the blade before blueing, so it could be remains of this? Is only speculates, but i dont saw other example of 607 without finish or with phosphate finish.
