I have the S&W 'bible" but this is a bit confusing. I have a 60-4 with a BNE prefix. That looks like it put it as being built in Feb. -Mar. 1993. I read somewhere that the special order number pinpoints the DOM. Mine is 2174. The explanation is that the first digit is the year (1992). The decade would be obvious. The 174 means the 174th day which would be in June. I'm not sure I buy that explanation on the special order #.