no
No, it doesn't require a period.
RD is not a coin grade. The letters RD are the abbreviation for the color Red. They usually follow the grade of the coin such as MS-60 Rd. This refers to the overall color of the coins surface, used mostly on 1 cent and other copper coins. Other abbreviation's are: B=brown, RB=Red Brown.
The abbreviation for number is No. (has a period at the end). Numbers plural is Nos. (again a period at the end).
The word class is not an abbreviation, its a word. You may see an abbreviation 'class.' using a period to indicate that it's an abbreviation. If it is used with the period, it's short for 'classification'.
If a colon is required in the sentence in which the abbreviation occurs, there is no rule against a period preceding the colon.
no
Mr. and Mrs. take a period, but Miss does not at it is not an abbreviation.
It is Rd The abbreviation for road is rd. its rd.
No, "Mr" does not require a period after it. It is considered an abbreviation, and in formal writing, the period is typically omitted.
The abbreviation for reading is "Rd."
it can be either
the abbreviation is confederate rd
rd.
No, it doesn't require a period.
Old Post Rd.
When written as RD, it can mean the abbreviation for reaction of degeneration; reaction of denervation; Registered Dietitian, Radial Deviation, Radiology Department, or Rate Difference.
Miss does not require a period after it, it is not an abbreviation. MS can be used for any woman regardless of marital status.