I will have to take off the my other drum and see what the date code is. Hopefully the stamp is more clear on that side. I would assume like Garys the dates should be pretty close, so my other one may be around 227, which would be spot on for the when the rear end was stamped on mine BU 0815G2. (August 15th)
Likewise for Gary's : 241 would be the same date his was stamped * BU 0829G1 (August 29th)
Seems like the ink stamp, and metal stamp should be somewhat close. probably not many original cars to get data points on this though.