That may well be only a single outlet pump, especially as the seller is suggesting it is suitable for Raleigh and Levis. It is much older type than those fitted to a Brum Scott, having the small diameter adjuster knobs with locknuts instead of the later type with larger knobs, spring loaded, and with the little brass plungers acting on the underside of the knobs, as previously discussed. It is probably as old as 1929 to about mid-1930’s. If you are still interested in it you should get the seller to confirm that it is a double outlet type. I can see that it has a Scott crankcase door, but don’t rely on that to identify the type.