13. I'm pretty sure it must be from Brunswick-Lüneburg-Celle and it will be one of these three types, KM# 203, KM# 206 or KM# 220:

Unfortunately, there are no weights and diameters, and no pictures and proper descriptions for the KM# 203 and KM# 206.
I don't think it's the KM# 203, because when I compare it with the picture of the KM# 220 I don't think your coin has a small crown on the obverse.
I don't think it's the KM# 206 because that's a 1/4 Thaler and should be bigger so more room for a less abbreviated legend.
It won't be the KM# 207 Thaler because that's a much bigger coin with full obverse legend: CHRISTIAN:LUDOVI: CUS D.G. DUX BR: ET LUNEBERG
So, I would go for the KM# 220 although the picture shows, in comparison to your coin, an additional legend NEB on the obverse and ANNO on the reverse. But the picture is from another date and in those times legends are often a bit different depending on the year.
My choice is just a guess (by elimination) but I'm afraid to be sure you'll need someone with a more specialized catalogue.