ID'ing signal/grnd solder posts on old Senn drivers

[warrior05]

Please take a look at my pic below. It is a close up of an old HD590 driver's solder posts. See the white mark (it is painted on) boxed in red? Is this telling me which post is signal and which is ground? If so, please let me know which is which.

Otherwise, generally which side does Senn typically put the signal post on?

TIA!