Need help with hallmarks on watch case

Hello, I am new to the forum. I’ve been trying to research two hallmarks on a c.1915 Vulcain wristwatch case. There are two hallmarks/makers marks on the case. One is a crayfish/lobster the other is what appears to be the letter “H” above a pocket watch with a watch chain. I’ve looked on line and have had no luck in locating any information on these two marks. Any help would be greatly appreciated. Thank you.
Please see photo.
Vulcain hallmarks1.JPG