Is this stamp of any value?

Hi, and thanks in advance :)

My Dad is a stamp collector, he has ALOT.

He's running an auction at the moment and has $1 reserve. I'm doing some investigation into this stamp on his behalf.

My Dad has put in the description of his auction:

"1905 Victoria Australia com/wealth issue,One Penny in red over two pence dull mauve wmk inverted CR/A perf12/12half Will put scans on soon "

I don't understand any of that, though he has tried to explain it.

If you are able to be of any assistance, that would be greatly appreciated.


Thank you
Sophia