I do not know where you are Somethingwitty but in the UK we are currently inundated with fake diazepam of all brands, including TEVA and MSJ. Some are under / overdosed, some contain other benzodiazepines or other drugs altogether (2 'MSJ' blue tablets recently came back as containing promethazine and MDMA (?!!!!!) respectively), some are just bunk. Get them tested if unsure of source! MSJ are a legitimate Sri Lanka based pharmaceutical manufacturer who do produce generic diazepam, but whether or not your tablets are genuine or a counterfeit is for a laboratory to discern. We cannot perform any substance ID's here beyond signposting you towards those that can.