Can anyone help with dating the following two drums. They came together with a Rogers kit I recently purchased. The serial # on the 8 x 12 Tom is D 962065, the snare is D 956723 and I believe is a COB?. None of the other drums have serial numbers (i.e., 9 x 13, 16 x 16 and 14 x 22). They appear to a matched set and the former owner had them since the mid 70's. I could only get one picture to upload. Thanks.