Bradley and Hubbard Lamp

Four of the six panels have cracks in them and the glass needs some cleaning but otherwise this lamp is as it always has been.    It was appraised for $1000 at Antiques Roadshow last year; however, it was at the end of the show and the table was mobbed with people.  The appraiser did not know it was signed and numbered - just took one look at it and that was it.  I wonder if the markings make any difference in case I should ever want to sell it.