I remember the first time I saw a numbered tatoo on the arm of a person. I was about 13 years of age. We had our freezer quit working and had to call a repairman. The repairman arrived and he spoke with an accent' . I was watching do his work......as with boys my age at the time, watched to try and learn something about repair. Then I noticed that on his inner forearm there were a set of numbers tatooed......... I later asked my Father as to what they were and he told me.