timebomb serial discontinued

For sale a "Cannon yellow" Ti Timebomb1. It is in immaculate condition. Never used but displayed. Links, glass, sight glass, clasp and finish is mint. It is a second generation as it has the double clasp with the "O". Comes with a black box only. Asking $750, shipped, insured and signature...

I know the TB was released in late 1998 and originally had serials; which were later dropped. Did they discontinue the serials on TBs at the same time they did on x-metals (end of 2004)? If not, when? Also, when were TBs discontinued altogether? @Romeo Van Frogskinstein? Thanks!