I've got an ancient HP ProBook 4510s here which I'm trying to find the proper (Windows 10) keyboard for.
It's been used by a czech family, but the layout doesn't seem to match that either.

I've got an ancient HP ProBook 4510s here which I'm trying to find the proper (Windows 10) keyboard for.
It's been used by a czech family, but the layout doesn't seem to match that either.

The key labeled Ç is distinctive. Searching led me to the Wikipedia article on Ç, which has a section dedicated to computer input of this letter:
On Albanian, French, Portuguese, Spanish, Turkish and Italian keyboards, Ç is directly available as a separate key
That leaves us with 6 keyboard layouts to look up in the worst case scenario.
Wikipedia (of course) has a dedicated page for every keyboard layout and I've quickly found that your laptop has the Portuguese layout.
Run the following from the command line
wmic path win32_keyboard where "Description='Standard PS/2 Keyboard'" get /value
Note the Layout value, and search the value here https://learn.microsoft.com/en-us/windows-hardware/manufacture/desktop/windows-language-pack-default-values?view=windows-11