SID revisions

The four digit number below the type indicated the fabrication date. The two first digits are the week of the year. The two last digits are the year.

6581 R1 (unmarked)

None yet.
Maybe never released on the market.

6581 R2 (unmarked)

Picture by [Tim Boescke]

The both upper SIDs from 1982 and 1983 are R2, the one from 1984 at the bottom is R3.
The differences are not visible from outside. Check the section [SID dies] for a look inside the packages.

6581 R3

Picture by [Peter Sandén] Picture by [Peter Sandén]

Picture by [Peter Sandén] Picture by [Peter Sandén]

Soon...

6581 R4 AR

Picture found somewhere
on the net
Picture by [Peter Sandén] Picture by [Peter Sandén]

Soon...

6582 (A)

Picture by [Peter Sandén] Picture by [Peter Sandén] Picture by [Peter Sandén]

Soon...

8580 R5

Picture by [Peter Sandén] Picture by [Peter Sandén]

Picture by [Andrea Marchi] Picture by [Andrea Marchi]

Note: One of the sids is CSG the other one is MOS. Looks like there were two plants manufacturing the SID at the same time!