Brass Lamp Reg Number

Can anyone shed some light on the reg number on the leg of this brass lamp there’s possibly another mark on the bottom of a leg, any help greatly appreciated.

 

Throwing out a guess that I'm not very optimistic about, "R [raised D (with an underline under it)] 63241"

Referencing the following page, that would date this at 1887:

https://www.bl.uk/business-and-ip-centre/articles/what-are-registered-designs

 

Thank you will have a look it’s much appreciated.