5 groszy 1923 Rzeczpospolita Polska -- help needed with coins identification

I need help with coins identification as shown below. I have 8 coins all of them 5 groszy 1923 Rzeczpospolita Polska.

All of them are identical in diameter but all of them different colors and significantly different weights denoting different materials.

All 1923 5 groszy coins minted in Warsaw color should be yellow (brass). So what are the other coins made of different materials then? 

Apparently, the previous question on the forum was not answered satisfactorily.

https://en.numista.com/forum/topic136160.html

The Polish 5 groszy 1923 was struck for business both in brass and in bronze:
N#4114 (brass)

N#5632 (bronze)

All yellow or yellowish coins will be brass, and all red or brown ones will be bronze.

According to the Numista catalogue, the brass ones are slightly heavier (3.5gr) than the bronze ones (3.0gr). Your results seem to show that the weight difference is smaller: appr. 3.4gr for brass and 3.2gr for bronze.

The only thing I find strange is the 3rd coin from below which seems te brass (but I'm not sure), but weighs 3.2gr only.

ArnoV

Apparently, the previous question on the forum was not answered satisfactorily.

https://en.numista.com/forum/topic136160.html

 

The Polish 5 groszy 1923 was struck for business both in brass and in bronze:
N#4114 (brass)

N#5632 (bronze)

 

All yellow or yellowish coins will be brass, and all red or brown ones will be bronze.

 

According to the Numista catalogue, the brass ones are slightly heavier (3.5gr) than the bronze ones (3.0gr). Your results seem to show that the weight difference is smaller: appr. 3.4gr for brass and 3.2gr for bronze.

The only thing I find strange is the 3rd coin from below which seems te brass (but I'm not sure), but weighs 3.2gr only.

Yes, you are right. Previous answer was not answered in a convincing way. 

Your feedback is much better. Appreciate it.

And I agree with you 3rd coin seems strange. 

Is it possible that 3rd coin 3.2gr is made of BRONZE and consist of mixture 89%Cu 11%Zn?

https://www.ngccoin.com/certlookup/3928543-011/NGCDetails/

I'm not sure I believe what's on the two Numista pages.  SCWC states the weight of both to be 3.00 grams. Also it states the Y10a 1923 only had a mintage of 350 and all were proofs.  Numista has the same 32,000,000 mintage for both the Y10 and the Y10a along with the 350 Y10a proofs).  Something is amiss.

rsirian1

I'm not sure I believe what's on the two Numista pages.  SCWC states the weight of both to be 3.00 grams. Also it states the Y10a 1923 only had a mintage of 350 and all were proofs.  Numista has the same 32,000,000 mintage for both the Y10 and the Y10a along with the 350 Y10a proofs).  Something is amiss.

 

 

something is not right for sure