Some questions on HP-41

[Gene]

Not an endorsement of ebay or the seller (who I do not know), but search for item 133008715082 and you will see one of two original overlays that HP included with the HP-41C. The other overlay included looked exactly like this one but did not have any of the shifted functions present.

Some modules included overlays and they were colored more like the faceplate black of the HP 41C, but the overlays included looked like the gray one in the item above.