Fuller Cylindrical Calculator - slide rule

Hi,
I have a Stanley cylindrical slide rule - Fowler Calculator - and I wonder if anyone might know more about it.
It's in a nice tailored and fitted mahogany box with rounded dovetails stamped Made in Great Britain on the lid - and it comes with a key and a leather carrying strap.
It is numbered 2465 with 1907 beneath ... I am assuming 1907 is the date of manufacture.
Others I have looked at are numbered differently.
Id be very grateful for anyone who can shed any light on it, or can point me in the direction of someone who can - or a website with all the variations.