This question explains that the extra hair emanating from the tefillin shel rosh of Rabbeinu Tam tefillin is a way to identify the shel rosh of Rabbeinu Tam tefillin vs. Rash'i tefillin.

If 2 tefillin shel yad were next to each other, one Rash"i and the other Rabbeinu Tam, how could one distinguish them from their exteriors, if at all?

  • Why do you think there is such a method? – Double AA Jan 11 '16 at 16:48
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    To my knowledge, on the tefillin shel yad there is no external difference. – Yaacov Deane Jan 11 '16 at 16:49
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    You can match it against the other Shel Yad of the same person and see which looks less worn. – HaLeiVi Jan 11 '16 at 18:36
  • @DoubleAA, he said why: because there's a method to distinguish the _shel rosh_‚Äčes. – msh210 Jan 11 '16 at 19:18
  • @HaLeiVi I'm not following this. IIRC< Rabbeinu Tam tefillin Is worn only following the Amidah. If you were to include the MOnday / Thurs. Tachanun and Torah reading, the amount of time wonrn is not that much less than the earlier part of Shacharit that it would make that significant a difference. What am I missing, here? – DanF Jan 11 '16 at 21:27

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