![]() The shells were complemented by a 1” reinforcement ring of maple. Shells from 1960 through the fall of 1968 were comprised of two mahogany plies with a single poplar ply sandwiched between. 1976 917XXX - 1290XXX 1978 XXXXXXX 1979 XXXXXXX - 2013537 Shell Construction If you happen to know your woods, examining the plies and interior finish can be instrumental in era identification, but again, the drum may have been modified through the years. The first B&O badges from 1969-70 continued sequentially from the six-digit Keystone badges, but in 1971 the company incorporated badges with no serial number, referred to as “blanks.” Ludwig re-integrated the serial system in either 1971 or 72, but the leftover blanks were occasionally used throughout the '70s. 'Blank' Badge Whereas the Keystone badge only had two iterations (one from 1960-63 featuring no serial number and an update from 1964-69 with serial number found at the top or bottom of the badge), the Blue & Olive badge went through a number of modifications from its introduction in 1969 through the mid-'80s. ![]() In addition, the Keystone badge was reintroduced on certain models in the early '80s.
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