spade giii mbf A new variety of SPADE MBF

[mio49]

hello,
You know the M B F ET H REX F D B ET L D S R I A T ET E date type for Spade.
Is the M B F ET H REX F D B ET L D S R I 1788 a new type ?

https://img.over-blog-kiwi.com/0/82/98/46/20200523/ob_ce44f4_mbf-1788-ib-may2020-s.JPG#width=1468&height=1369

 

In fact, I haven’t found it in the A THOUSAND GUINEAS.
Is it rare ? Is it a mistake ? Do you know its history ?

Thanks for your answer