Dear Hari, very interesting note of yours on deciphering of the case codes. To add, I have a Kohinoor Black Dial bought online in 2015 with case code 040911 screw-type back. Can I infer that this is made in WFT (Tumkur) since WF-4 is Tumkur and probably produced in 2011 - but one doubt that creeps in, is whether WFT produced hand-winders in 2011 as some say WFT stopped making mechanicals in 90s and shifted entirely to Quartz production. That leaves us to think about the other two - WF-3 (Chinar) and WF-5 (Ranibagh) but the coding convention is again different since WF-3 has 4 digits without gap eg. 0398 and Ranibagh has 6 digits in split form eg. 5 11 005. Anyway that you could help me out to infer ? One additional info is the bottom print on the dial says INDIA 0231 as the movement type.