Now, you are getting me confused, ( which is not hard to do). B Prefix was used in 1896 until 1902 and again in 1909 until 1918 on the Small Frame Hammerless .32 revolver. the A prefix was used in 1896 and 1897 and once again in 1909 until 1914 on the Small Frame Hammer .32. Small Frame Hammerless serial numbers begin , 1896 B0001 and end in 1902 at B100000 { estimated }, used again in 1909 at B0001 and ends in 1918 at B100,000 { estimated }. The Small Frame Hammer serial number A Prefix was used in 1896 starting at A00001 and ending in 1896 at A100000 { estimated }, and yet once again in in 1909 starting at A00001 until 1914 ending at A100.000 { estimated }. Apparently Iver Johnson used batch numbers and even that does not appear to be a consistent practice in their hundred years of production. Info from page 62 of Bill's book. This why when looking for a year questions arise such as , which way is the owl looking, coil or flat main spring and single or double post. Enough to make a sober man drink, or a drunk man sober.