I've never seen one of those with the BSA logo before this, but back during the Bike Boom we'd periodically get identical Triumph branded 10-speeds. Back in 1972, they sold for $90.00 whereas a Raleigh Record went for $100.00 and a Raleigh Grand Prix was $125.00.
We were never sure why we were getting them. As it was the Bike Boom, anything Raleigh (the dealership was Schwinn/Raleigh/Columbia/Astra/Roger Riviere and later Japanese Concord - that's how desperate we were for bikes) was pre-sold six weeks before we'd get the bike and Merle Adams (the owner) would get pissed if we got one of those instead of a Record. No real matter, it'd sell immediately, but the Record we could sell ahead of time while we had to wait for the Triumph to actually arrive. And no, it wouldn't be an extra bike. We'd be short one Record.
Yes, that's a Sports stem, where the Record would have a Pivo alloy or equivalent, as was expected on a cheap 10-speed.
Merle always called those the "B" line bikes, a cheaper version of the Raleigh. Regular steel frame, not 2030, cheaper rims, seat, but most everything else was Sports level. About the same level of kit as an AMF Hercules. They were uncommon in 10-speeds but rather common in the 3-speed line, as a '72 Raleigh Sports cost $100.00, the Triumph (blue) and Dunelt (red) 3-speeds cost $85.00, and a Japanese copy with Shimano hub (I believe it was a Kent) cost $60.00.
I was always under the impression that the BSA marque disappeared somewhere in the mid-60's. I've seen one or two around, usually owned by a BSA motorcycle collector.