Need help for this coin (Roi de Belges / Helvetia) 1876 [решено]

This is from a member from another forum asking for info on this piece: I thought I would see if any of our members could help.
THX Ed

Dear collectors,
I have this coin in my collection, however I have hardly any information. The only thing I know is it that is a "test coin" from a new kind of mint press back in the day. Oddly enough it features the King of Belgium (Roi de Belges) on one side with the Helvetia (Switzerland) on the other side. It weighs 6.45g and has a diameter of 21mm.

Please send the pictures to Marc, he has made a complete inventory of all belgian medals, tokens and jetons.
He propably can help you
marc.willemans@telenet.be

Please keep us informed ... Thanks

I have some books on swiss patterns, I will check if I can find more information on this mule

The bust of Leopold II is the pattern of a belgian 20francs gold coin.
The LW is the mintmaster/die cutter Leopold Wiener
http://www.electacollections.com/en/product/2620409/WORLD-COINS-GOLD-COINS/Belgium-20-Francs-Gold-coin-King-Leopold-II-1874/
http://www.apmex.com/product/12652/1876-belgium-gold-20-francs-leopold-ii-ms-64-pcgs

Found it

Swiss 20 Francs Pattern 1876
Made by the american die cutter and inventor George Fracis Champney while he presented his new coin press machine in Brussels (Belgium) in 1877.

Unfortunatelly he did not achieve to sell a single coin press.

Private minted pattern where original coin dies from two different coins where used.

Of great rarity and if real I think should be graded by one of the two big grading companies if real.

Does the edge say CHAM PNEY BOSTON as it should be?

Thank you all: will pass info on. This is the most knowledgeable site I have ever been on. THX Ed

Hi all, I have found the same in copper. 👍