Roman letters were used prior to 1940, the last Roman letter being P for 1939/1940.
For a non Arabic speaker it`s difficult to decipher date letters, sometimes being different only in the position of dots or the curve of loops. The issue is further complicated by the reuse of same letters.
The closest image of date letter seen in the bangle is for year 2002-2006, but the same letter was used for 1949/1951.
This official site of the Egyptian government provides full list of date letters.(Date letters after 1950 were used for range of years rather than for a single year).http://www.mti.gov.eg/affiliates/Nation ... wa/A03.htm