I really don't believe Bear ever stopped building T/D's.I've seen several Bear T/D's that have the raised plastic button,,,,,no gray plywood riser same as the early model black and tan just has a raised plastic button.The serial numbers on those risers will range in around 2500 (1972ish) and up to I believe B-2789 ??? 1976ish maybe 1978ish which was black and tan no gray plywood riser and had to have been built later on cause in came with a set of factory in the box Norwiegen Blue Tip Limbs!!! 1976ish same as the blue limb tip super K's...... bd