That is not a stock chip and does not look like a SW chip either.
If I had that chip in hand I could tell you exactly what's different between it and a factory 89 chip.
I can tell you that you do have a 87-89 DME with 28 pin chip socket.
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Sal
1984 911 Carrera Cab M491 (Factory Wide Body)
1975 911S Targa (SOLD)
1964 356SC (SOLD)
1987 Ford Mustang LX 5.0 Convertible
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