Looking for the engraver

Does anybody know who engraved tbis medal? Signature says R J H K?

It says 1939 but it seems that the 3 is above an older 1. So nbr. 9. Neudorf is in Germany. The medal is sold as French. I bought one for my collection.

Raymond Joly (1911 Paris – 2006)
Perhaps.
https://en.wikipedia.org/wiki/List_of_medallists#French

I already thought of R.Joly but he signed R. Joly.

I think it must be German. I dont believe they hired a French to do a commemorative medal for Neudorf. Between 1911 and 1939! Very unlikely I suppose.

Neudorf in Strasbourg France
Concours Produits

The same reverse engraving is on this
https://www.ebay.fr/itm/161695734702

Médaille : France
Recto : Gymnastique sur barres parallèles
Verso : Conc. Prod. Spec. NEUDORF 1939
Diamètre : 4 centimètres , en bronze argenté et en bon état

Wow. Didn t know there was a Neudorf also in France!
Do you think both medals were made by Raymond Joly?
I am not quite sure. mmmm. There is one medal signed R J, but not in this way.
The style is also very peculiar.
I am looking for a better picture of the other medal you attached.
Anyway, thanks a lot!!

I am unable to spot the same RJ signature in the medal you attached above. Seems to have the same reverse, but a different frontal design.