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Well, let's be a little clearer on this. The Model Motoring armatures were supposed to be 15 Ohms, but the factory in China (possibly due to the language barrier) produced 50 Ohm armatures. These were a mistake, not manufactured this way by design.

There was a time when MM offered replacement 15 Ohm arms if you received a 50 Ohm arm. I got a few myself.

I do not know how long the supply of 50 Ohm armatures lasted. So, if you see a MM armature, you will not know whether it is 15 or 50 unless you measure it.

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