First, thanks for correcting my spelling error on the Registered Design Number webpage. I have corrected it.
As Roy mentioned, I was aware of only one other lamp marked with the Registration Number 120760. It is on Plate V, number 3 of 19TH CENTURY FAIRY LAMPS by T. Robert Anthony. (attached)
The caption for that lamp reads:
3. Pink porcelain light house with formed brass top fitting and ivory carrying ring. Seven inches high. It is marked "Depose Pantin Reg. 120760".
A point of curiousity: The design number on Roy's lamp is perceded by "REG" instead of the more common "Rd". I am not sure what, if any, significance this may have. Hopefully, someone might have some information.
I also indicated to Roy that similar lamps with several subtle differences have been attributed to Central Glass in the US. It is curious, however, that Central Glass promoted their lamp at about the same time that the Stumpf design was registered. The Central Glass variants are unmarked.
The following link will take you to a newsletter article on the Central Glass variants of this lamp design.
Jim.