I've been looking up various sources on this coin's specs. You can see Bruce's details below from the Krause Catalog (Unusual World Coins, 4th Edition). According to him, it's X#7 and made from gold (struck in 1970). However, NGC claims that X#7 is 0.500 silver. Both sources pull spec data from Bruce's cataloging info, yet they conflict on the composition. To make matters even more confusing, Colnect shows data (presumably from collectors) that this fantasy strike of the same design is gold plating over copper. Are there more variants of X#7, e.g. X#7a, X#7b, etc. that distinguishes X#7 by different metal compositions? Perhaps a later edition of the Unusual World Coins catalog show more variants of X#7. Also, both state that it's a Type II design, but I'm not sure what the difference between Type I and Type II are - does anyone know for certain? I do notice that the "III" on the obverse by Mussolini's helmet is different on examples I see on the 'net. Sometimes the last I in III is touching the helmet, sometimes it's not. Another variant has each I in the III not touching each other. Thanks in advance!
Are you asking about the 100 Lire or the 20 Lire? The one @paddyman98 posted is the 20 Lire, so a weight for comparison to your original 100 Lire won’t help much. I have editions 4, 5, and 6 of Unusual World Coins and none of them differ from the 4th Edition you posted. That being said, these Krause catalogues are far from exhaustive or error free. If you study pieces long enough, you’ll quickly surpass the knowledge of Krause.
I wanted to know the weight of the 20 Lire one as well to see how accurate the catalog is. Thanks for the info on the 4, 5, and 6 editions being the same. I think that the catalog is missing variants.
I read that it was made to sell to tourists, and that the same mint that made the Hitler fantasy coins made these, too. If that info is known, then maybe the source of these Mussolini fantasy pieces can be solved. Not from any printed source, just stuff I read on forums while researching these coins. So take it with a grain of salt.
According to the catalog, all 20 Lire ones with the same design and a silver color are either X #2 or X #2a. Within each of those, there appear to different types as well, judging by the different designs I've seen. The most common weights I've seen are either 20.4g, or they have a wide range between 14.13g and 16.44g.