Virtually all the pistols in the early 10000, 10000B, and C suffix carbines are different in one way or another. I am not sure that the lack of another two digit C suffix cased carbine would indicate that none could exist. The Diaz carbine is a 1902 and the 55000B would put the range far into the 1906 production run.
I know that some of the other forum members gather serial numbers, and it would be good to hear from them if they have recorded 55000B range pistols.
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