Hi, my name is*****'m a certified appraiser and I'd be happy to help.
I am seeing a partial photo of the chair. Can you provide a complete overall photo, and a clear close-up of the embossed name?
The photo of the signature is very blurry. I know it's hard to do, but could you get it clearer? Maybe take it out into the sunlight? If it is a designer's name, it might be very important to value, and every variation of "Manconetti" isn't getting me anywhere.
Are you positive? If so, this isn't a known maker.