USA £1 Mule: Why?

I purchased this note, though not arrived yet. It was described as a Mule and after reading what one is and looking at the note......I can't see why. Please explain. Thanks.....marbury

 

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Paper money mules are weird, they're not obvious like a coin. Here's some more info: https://www.pmgnotes.com/news/article/8175/pmg-learn-grading-mule/
Even after reading that, I still don't really get it.

 

I could be wrong, but I think it is a similar mule to the one in the link provided by @Lon Chaney … The back plate is F73/2000, and if I read the link article right, then this back plate # was also one used for a series with Burke as Treasurer.

Since it was used on an Elliot-White front plate, it is a mule too…imo…Spark

 

Here's mine for comparison

 

I must sound unappreciative but I thought the members from the US would spot it immediately.........so a Brit has no chance it seems.

 

Alright, I figured it out. I have one of these, raw, I'll check it tonight.
Anyway, here's the correct backplate number position:

And here's the position for the mule note:


And a blurb from HA:
"For Fr-38 and 39s the non-mule back plate number location is at approximately 4:30 on the left-hand side of the open space area and the mule location is at 6:00 of the left-hand side open space area."

 

Yours is Fr. 36, so different signers.

 

Thankyou.......so nothing very exciting......but at least now I know.........much appreciated

 

I forgot I had a pdf with my currency collection on this computer. Mine is Speelman/White, Fr.39. No mule.