HP-11C Logo

[BobVA]

(06-25-2019 12:01 AM)Punwin Wrote:  She also wants to assure her teacher that in fact is a HP-
11C...

If it's of any help while you're waiting for the replacement, you can perhaps assure the teacher by showing him/her the manual and the calculator - the keyboard labeling will uniquely identify it as an 11c.

If that doesn't work, perhaps letting the teacher go through the ON/+ "self test" routine in the manual will. It takes only a few seconds and the last step of that check puts the calculator model number ("11" in your case) on the display, (Actually that's better proof than the logo!)