Light and Heavy Coin Types [opgelost]

Do types of coins really need a separate page because of thickness/weight? Because overall they are the same design IMO, and for some coins, SCWC simply adds a .1, .2, etc. for these types.

Here are some common coin examples: 

N#3522 and N#3522 

N#298 and N#18132 (there are slight design changes between the two)

N#367103 and N#3245 

And for an example of exonumia:

N#117977 and N#117978 and N#117979 

Depends on the age. For modern coins separation is definitely needed, because change is intentional. For ancient and medieval, I think, it is not needed most of the time, because their weight, thickness, and even size can vary significantly, and most of the time it is not intentional.

After doing more research, seems like the 1 gram difference for some coins do not warrant a second page, as for instance this coin: N#1016 has two variants and slightly different catalog #s, both regarding weight differences. But, this 1 gram difference for this coin does not warrant a separate page. 

Agree but it wasn't so much the weight but the use of different planchet thickness by different mints that it got different reference numbers.

rsirian1

Agree but it wasn't so much the weight but the use of different planchet thickness by different mints that it got different reference numbers.

Then again, why were the the Argentinian 1 centavo and 5 centavo pieces from 1986-1987 given separate pages when they were a gram different from each other?

Those were also a thick/this planchet to get the sub KM numbers. Obviously that drives into the different weights, too. The real answer to your question is 19 years of different people entering coin pages and different referees approving them and more different people revising them and more different referees approving those revisions all working to what they believe should happen with coins of different planchet sizes creates many examples like this. Expecting everything to be consistent with everything else in this “crowd funded” catalog is unrealistic.  The Guidelines addresses when different pages should be created:

The same type may include:

• Different dates, mints, officinae, mint officials, mintmarks, and engraver’s marks
• Different catalogue reference numbers
• Small diameter, mass, shape, and thickness variations, especially for ancient and medieval hammered coins
• Different minting processes (proof strikes, polished dies, etc.)
• Random variations such as edge, obverse and reverse orientations

Everybody has a different definition of "small."

There was an attempt to split a couple Liberian coins because of the 1 gram difference: 

https://en.numista.com/forum/topic115993.html , but it got rejected. The thread did cover other coins that were either split or not split because of weight differences. 

IMO, the Numista coin guidelines should slightly change regarding coin weight.