The mystery deepens

It's common knowledge that Roland used different transistors in the production run of TB-303's. But the general consensus was that the transistors in question were 2SC536 and 2SC945, but today I came across this image on the x0xb0x forums posted up by Ripe909 of Social Entropy fame. Here's what he said.

"Just to add to this, I have an original 303 with a different part used: C1685" ... "the solder joints look original and the same part is used throughout the machine."

This is very intriguing indeed.