Unfortunately, the Vox bulldog didn't have any of these code styles. However, I now know that the speaker in a Rivera R-55 I'm working on was made on 28March1992.
But, I think I figured out the AC15's approximate birthday. I finally got around to cracking the back open and it's clearly not a vintage model. It's all PCB construction. Well, the circuit seems to match up with the schematic for the AC15 - after 1996 that I found at the schematic heaven site. The serial number is M1998-48-1495B. I'm guessing it was born circa 1998.
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