Hello Rob,
Your 27mm model in gilded bronze on the flankless reverse, is not an Allied medal. However, Alexlander J. LASLO considered it unofficial type 1a. Alexander Laslo mentions that the stock of this medal has been used for other medals, except that it is the reverse. The house "Delande" made this medal with the blank reverse for various associations.
In 1921, France still not having an official model, the military wore either a Belgian uniface model or a Charles model, the "Delande" house therefore took the opportunity to publish a model from its generic model.
This model was marketed in the catalog of the house "Delande" in June 1921.
If one follows logic, there are only two medals which were produced exclusively as an Allied medal, the official model "Morlon" and the unofficial "Charles" model. This is why on my site, I do not classify the "Pautot-Mattéi" and "Charles" medals as official models but as curiosities.
However, your medal remains interesting, because according to the ribbon,
I think if Alexander J. Laslo was still in the world he would have published a new book, because at the time he wrote his last book he did not have the internet resources that we have today.
I take this opportunity to congratulate you on the quality of the models you own.
Best regards,
Jean-Michel