Andy's right - the item you are thinking of is quite plentiful on the second-hand market.
It was a ware-houseman's tool for ripping stencils off crates that were to be re-assigned. No longer done for various legislative reasons....
However from a distance and in poor light, the Stanley No: 70 has a resemblance to a Stanley No: 82 Scraper:
https://www.handplane.com/225/stanley-n ... t-scraper/
and from your post you inferred that you needed a scraper.
This No: 82 is very hard to find in the UK, perhaps because it was not marketed here... not sure about that.
In my opinion and with my dodgy wrist-joints, this is one of the most versatile scrapers to be had, not only for scraping flat surfaces (you can double-up a pair of ordinary, sharp card-scrapers for stiffness and get an exceptionally even scrape on the flat) but because its own blade can deal with curved, surfaces, concave or convex, depending on the degree of hook and pull-pressure it can hog a lot of wood off for shaping from the rough or give a light pass with fine shavings. Its success for me is that it allows very even pressure, light or hard on sections that ordinary scrapers cannot reach.
You'll gather that I'm in favour of this little tool!
Good luck