Need Help Deciphering USRCS Rating Abbreviations

[usmedalman]

I am going through the rolls for Revenue Cutters used in the Span-Am war and have two ratings which I cannot decipher: O.M. and Or. Mr.  As a whole there doesn't seem to be an official standard for abbreviations of ratings and online references for the RCS that I have been able to find have not been helpful. I am hoping that one of you experts will be able to help.

 

[Justin B.]

That's a tough one. Is it possible that it's Q.M. and Qr. Mr. for quartermaster? Otherwise I'm stumped.

[usmedalman]

10 hours ago, Justin B. said:

That's a tough one. Is it possible that it's Q.M. and Qr. Mr. for quartermaster? Otherwise I'm stumped.

That was my thought, but there is a Q.M. on the same cutter, USRC Morrill, so I kind of eliminated that thinking, why would someone use three different abbreviations in preparing the same roll.