Grelot also seems to have made blades for others, so if you know what to look for you can purchase a Le Grelot made blade under a different name. From what I've seen the blade profile, the number stamped on the reverse of the shank, and blade etch are indicators.

I have a 7/8ths Lotus French made razor that definitely was made by Grelot.

I have had full hollow and quarter hollow Le Grelot razors in 7/8, 6/8, and 5/8ths sizes pass through my hands and every one was a superb shaver.