I'm not sure about this model either, but I Googled the number and found this:
General purpose plane with a machined fine grey iron base.Razor sharp replaceable blades are quickly and easily changed.Spare blades are safely stored in the handle.Fully adjustable for depth of cut and alignment.Ideal for stock removal, smoothing and rebating wood, and with RB109 blade fitted, will plane plastic laminates
The description was on a for sale note somewhere in the UK.
When I did a search on the Stanley Tool web site, I didn't find any reference for this model number.
Ray