HP-27S 50th Anniversary Limited Edition really?

[Allen]

Have you been able to check the ROM ID?

Adapted From the old forum:

1. Enter in "test" mode pressing ON and LN together
2. press [<-] (back arrow) to start the debugger
3. press the decimal point to display (left side of screen) the ROM ID
4. To exit press ON together with e^x ( resets calculator)
   

On my 27S (SN 2913S...) I have ROM ID B.
Some years ago, I found a pre-production HP 17B calculator that had ROM ID PP1.