For some reason, KM has #439 only from 1773- 1775, and then KM# 442 from 1776-1784, but I do not see the difference between the types according to images I can find.
No the M is also on the large bust coin the coin page had the wrong image and you could see it there. You can see a bit of it on the Krause images too.
No the M is also on the large bust coin the coin page had the wrong image and you could see it there. You can see a bit of it on the Krause images too.
However, no M for the years 1778-1780 with the large bust. I think this is clear in the two links (Numisbids and MA-shops) in the original post.
From the Zottl catalog number sequence, it looks like he considers those years a different type.
The current listing N#31537 now has comments added that 1773 has a small bust, and 1775 has a large bust .
The Creation Request for KM# 442 covers 1776-1786, and corrects the mistakes in Krause on 1778-1780 with no M, also providing an example of a 1778 with no M in the Comments field.
It means the original poster's 1778 will go in the new listing for KM# 442.