Welcome I hope it helped The diamond shape maker marks might have the initials of the maker If you have the cross you can look with magnification if the seller has it you can ask him to look for letters within the mark In my experience the First Empire LOH are rare maker marked Mainly the hallmark is present on the ribbon ring as the one I listed above
All knight crosses from this period are Silver and anything from Officer and up are -18 Carat Gold
While on the topic - there are LOH, which some classify as "100" days model They are hybrids between the 1st Empire and Monarchy Periods crosses The 1/2 size LOH on the middle of the pictures bellow. Some of those crosses have 1st Empire central medallions. In my opinion it was very turbulent period and parts were quickly replaced and reversed depending of who was the Ruler for the moment
Any way I do not believe that your LOH is from this Period
I hope more members will reply with their knowledge and opinion
Regards