[jan-jaap]

Yeah the whole machine is full of stamps like that. The VRAM SIMMs have a stamp 87-52 and 88-11, so perhaps the PCB was wk52 '87 and they were assembled or tested wk11 '88.



Same for the ASICs on the DE3, wk11 '88 for the XBARs and wk06 '88 for the PMAPs:



According to the original user, the machine was bought in 1988 which makes sense. The GT graphics were announced late '87 and in October '88 the PowerSeries and Personal IRIS were introduced. The Personal IRIS had the same CPU and probably at least comparable graphics for a fifth of the price of a Professional IRIS, and the PowerSeries were so much faster, instantly obsoleting the Professional IRIS series.