The Bocama lugs on my Peugeot PSV have uneven length points with the top points longer thinner/sharper, as would other PSV owners would confirm, I'm sure.... The BB shell on the OP's bike definitely looks very much like the one on my bike too, except mine has pointed lug sockets for the seat and down tubes.......
As for chainstay bridges, many bike companies did not use the cast/waisted bridges and just use a short section of round tubing, specially on their standard model line bikes (non-special edition). I still think a cast/waited bridge is a small extra added touch for most steel bikes....