Thonet chair ?  

Here goes the photo of the complete chair

Don’t think it’s Thonet. I would guess one of their Eastern European competitors. Maybe Czechoslovakia or Yugoslavia. The cafe chair was one of the most successful products those times and was copied many times. Thonet had more than a dozen competitors within their product range. 

Yes, I'd agree with Browkin on this.  Almost every country in Europe had its own bentwood furniture factory and after Thonet's patents ran out in 1869 many companies began making copies of their designs.  Fabrica de Marca, I believe, essentially translates to  "trademark" or "brand" .  I did some searches but could not find any company with the elephant in their branding.  

Ok thank you, I knew they were bra'd radomsko etc but I didn't know they were so many... And never seen this elephant before.. 

Ok well thank you for taking a bit of your time to help me. 🙏

I have at home a book from Thonet. Thonet used in all their Labels Thonet brand name. No hint of an elephant.

One sticker (unfortunately from an unknown German or Austrian producer) used an elephant on their label „stable like an elephant“. It should point out, that the legs were extra reinforced and due to that the chair was more stable.

By the way, according to the book within the 20th century did exist nearly 200 different bentwood furniture makers in Europe. Many of them also in Italy or Spain. Fabrica de marca might be a Spanish producer. The Italians used fabrica Di marca.