Cake Server- Silver/ Silver plate mark/ stamp help please

I am wondering if anyone can decipher the mark on this cake server please?
12” long
The handle tests as silver and the blade is base metal but I’m wondering if the handle is silver or plate?
Google suggests French but I can’t find any marks that resemble this. Thankyou for any suggestions.

 

Maison Odiot?

 

The lamp is a match.

 

So it is!

Fantastic @Marote, I wouldn’t have found that! Thankyou very much

 

https://www.ascasonline.org/ARTICOLOGIUG207ING.html
"From 1906 until 1956 the mark "O, an antique lamp, BSr" was in use for the Boulenger company"

 

Ah, you were quicker than me and found a much clearer example of the mark.
From a quick look they are an interesting company, I will do some research!
All the examples I can find so far either have the Minerva mark for silver or are marked Double for plate. I can’t find either of those on mine, just the makers mark so I’m still not sure if it’s silver handled or plate. Either which way it’s a nice find for £2. Thankyou @Marote , your effort is appreciated!

 

The maker's mark is in a square cartouche, so it's silverplate - if silver, the mark would be in a lozenge (diamond) like the examples cited...

~Cheryl