Two weeks ago Jim Duncan asked,

I collect French Revolution coins and currency and tokens, I suppose with a specialization in Monneron pieces, since I now own every variety (except another pattern that I've never seen for sale), + contemporary gold- and silver-plated ones (they were used as gifts), and the Monneron medallic pieces, in original bronze and gilt. And a gorgeous specimen proof. Over the years, I've seen many of these for sale, at least by French auction houses. This is a copy of one of several examples from the archives of iNumis:

Constitution, module de deux sols de Monneron à l'Hercule, 1792 Birmingham | iNumis, boutique numismatique

There is also a book specifically on the subject of Les Monnerons:

LES MONNERONS HISTOIRE D UN MONNAYAGE (French Edition): PHILIPPE, BOUCHET: 9782916996240: Amazon.com: Books

There is also a book specializing in the French Revolution token coinage, overall:

Les monnaies de confiance, Monneron, caisse de bonne foi, Lefèvre Lesage, Clémanson, (infonumis.info)

Jim writes:

To read the earlier E-Sylum article, see:
NOTES FROM E-SYLUM READERS: APRIL 18, 2021 : Monneron 2 Sol Pattern Piece(https://www.coinbooks.org/v24/esylum_v24n16a14.html)