Thanks to @Lamont for the tutorial and pictures (MP5/HK33):
"A word about fakes. There are a couple of ebay sellers based in Germany who have for years been selling BW surplus Z24 scopes that they have "tailored" to the American market, and they made a lot of money ripping people off. Here's how to tell what you're looking at. All of the BW surplus scopes are marked "Fero-Z24" at the rear of the tube. If it has this marking, it is a surplus scope and the BDC is set up for 7.62. The scopes that H&K ordered to be supplied with the 33E or the MP5/MP5k do not have this marking, only a 6 digit serial number. The 33E scopes are marked "0.5" beneath the serial number, MP5/MP5K scopes are marked "0.25". Surplus BW scopes have no similar marking underneath the serial number. The BW scopes are not originally marked for caliber and there is more than enough space on the ring to add ".223", which is what these two sellers did. Fake .223 turret rings have also been made. America does .223, not so much the rest of the world or foreign mil/LE buyers. A real 5.56 scope will be marked "5.56 NATO", not ".223". For the faked 9mm models the BDC markings of course could not be remotely similar, so they had new turret caps made to simulate the correct markings, but they marked them "9mm Nato". A real MP5/MP5k scope will be marked "9 NATO". Last of all, BW surplus scopes I have seen have flat head tapered screws to attach to the mount, real 33E and MP5/MP5K have dome head screws. The label in the lid of the case for these are marked MP5/MP5K, those for 5.56 are marked HK33/33E. There are people faking the BDC turret cap, but no one ever faked the case labels"
Thanks to @HK556WI for the picture (MP5SD) and BDC cams.
Tony
"A word about fakes. There are a couple of ebay sellers based in Germany who have for years been selling BW surplus Z24 scopes that they have "tailored" to the American market, and they made a lot of money ripping people off. Here's how to tell what you're looking at. All of the BW surplus scopes are marked "Fero-Z24" at the rear of the tube. If it has this marking, it is a surplus scope and the BDC is set up for 7.62. The scopes that H&K ordered to be supplied with the 33E or the MP5/MP5k do not have this marking, only a 6 digit serial number. The 33E scopes are marked "0.5" beneath the serial number, MP5/MP5K scopes are marked "0.25". Surplus BW scopes have no similar marking underneath the serial number. The BW scopes are not originally marked for caliber and there is more than enough space on the ring to add ".223", which is what these two sellers did. Fake .223 turret rings have also been made. America does .223, not so much the rest of the world or foreign mil/LE buyers. A real 5.56 scope will be marked "5.56 NATO", not ".223". For the faked 9mm models the BDC markings of course could not be remotely similar, so they had new turret caps made to simulate the correct markings, but they marked them "9mm Nato". A real MP5/MP5k scope will be marked "9 NATO". Last of all, BW surplus scopes I have seen have flat head tapered screws to attach to the mount, real 33E and MP5/MP5K have dome head screws. The label in the lid of the case for these are marked MP5/MP5K, those for 5.56 are marked HK33/33E. There are people faking the BDC turret cap, but no one ever faked the case labels"
Thanks to @HK556WI for the picture (MP5SD) and BDC cams.
Tony
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