I'm hoping someone can tell me what the code R 4, Subd 5/B refers to in Column 8 of a passenger record for the Orca. I assume this is an exemption code but not sure. I have only seen this a few time and all passengers were Russian or Polish and traveled on the S.S. Orca in 1923 0r 1925. (The current record I'm interested in is Image 220 of 784 for 2nd Jan 1925 from Southampton to New York on the SS Orca) Line 17 Olga Jemiec
Thanks for any help someone can provide.