I have owned each of these coins since at least 2010. None of them are magnetic.
#1:
Diameter: 17mm
Weight: 0.6g
Material: Billon?
Very thin. Royal monogram on obverse.
#2:
Diameter: 18-19mm (irregular)
Weight: 3.3g
Material: copper?
Hammered coin, clearly ancient. Coin alignment. Obverse has bust facing right. Reverse has profile of man. No legible text.
#3:
Diameter: 22mm
Weight: 1.4g
Material: copper or billon?
Very thin. Obverse has a royal monogram of crowned "C". Reverse is blank.
#4:
Diameter: 22mm
Weight: 3.2g
Material: copper or bronze
Obverse has circle surrounded by illegible text. Inside circle appears to be four columns. Reverse too damaged to determine any markings, vague impression of european crest.
#5:
Diameter: 22mm
Weight: 2.7g
Material: copper or bronze?
Thin hammered coin. Both sides show some crude illegible text.
#6:
Diameter: 22-23mm
Weight: 1.7g
Material: copper or bronze
Very thin hammered coin. No discernable images or text on either side.
#7:
Diameter: 23-24mm
Weight: 2.2g
Material: copper or bronze
Very thin hammered coin. Obverse contains crown with date "177_" above.
#8:
Diameter: 25mm
Weight: 4.2g
Material: copper or bronze
Medal alignment. Obverse bears european crest with crown at top and flanked by laurels. Field of crest is of diagonal checkers with smaller crest inset in the middle. Reverse has some text: "1 ____er" and "LANDMUNZ". Suspected to be a German States 1-kreuzer coin.
#9:
Diameter: 28mm
Weight: 7.5g
Material: copper?
Thick hammered coin. Obverse has a ring-shaped indentation. No discernable markings on either side. Ancient?
#10:
Diamter: 28mm
Weight: 10.4g
Material: copper or bronze
Thick round coin. Coin alignment? Obverse has bust facing left with "D" above. Reverse bears text "ET_I". Suspected French origin.
#11:
Diameter: 28-29mm
Weight: 9.2g
Material: bronze or billon?
Thick irregular coin. Coin alignment? Obverse has bust facing left. Reverse has small allegorical "hat on pole" motif near the top. Suspected French origin.
#12:
Diameter: 31-34mm
Weight: 21.3g
Material: copper or bronze
Very thick irregular coin. Over 3mm thick! Both sides are flat but pitted. No discernable images or text on either side. Ancient?
Can't offer much help but #6 and #8 are from German States Bavaria. #3 from French Colonies, here a simmilar one but different weight https://en.numista.com/catalogue/pieces7571.html
For the rest larger single fotos could help
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It's exactly the kind of royal monogram I've seen on many Scandinavian coins pre-1900. It has mirrored symmetry along the vertical axis, and bears the most similarity to the monograms of Swedish Karl XII and Karl XIII (such as KM#310). Could it be an early Swedish colonial piece?
It could also be a Danish coin of a King Christian (or possibly Frederik), or perhaps an early coin of the Danish West Indies.
(coin 4) it's a 1ct Willem III or Wilhelmina coin (Netherlands)
(coin 10) it's from Luxemburg (Letzburg).
The crown that I can see in coin 3 can be from Sweden, but also Danmark (both had kings named Christiaan). It's hard to identify it correctly by picture.
according to krause theres also a smaller type of that one not yet in the catalogue
km#1.1 (large countermark) >>> your coin
and 1.2 (small countermark)
Could not make out original images enough so quickly cropped and enlarged,
and brightened a few, and those later identified are marked as such on the right ...
I'm working on No.1; the observations made in 2015 about it being Danish are probably correct, with the monogram very much resembling that of King Christian X of Denmark, as seen on coins like this one.
1 isn't Denmark, they didn't issue coins in those dimensions not in silver. It's definitely not Danish West Indies. I believe it's a 18th century Norwegian Skilling. The silver content of those were so low that it could effectively be billon. I only collect Sweden and Denmark though, so I'm not 100%. You could run a specific gravity test to pretty much confirm.
Quote: "oggy"1 isn't Denmark, they didn't issue coins in those dimensions not in silver. It's definitely not Danish West Indies. I believe it's a 18th century Norwegian Skilling. The silver content of those were so low that it could effectively be billon. I only collect Sweden and Denmark though, so I'm not 100%. You could run a specific gravity test to pretty much confirm.
Quote: "donmart"#3
https://en.numista.com/catalogue/pieces7571.html
according to krause theres also a smaller type of that one not yet in the catalogue
km#1.1 (large countermark) >>> your coin
and 1.2 (small countermark)
#3 is called a "stampee". The first issue was stamped onto billon French coins that were badly worn, and they were sent to the French Cayenne and the French Antilles. Later, when more coins were needed, they were stamped onto blank planchets.
[identified] 
[identified] 
