5 speed usually means 1970s or earlier.

Stem shifters more like late 70s.

Could be a "bitsa" bike (motorcycle term), constructed of a bit of this, and a bit of that.
Nothing wrong with that, I have several bitsa bikes that I put together using a variety of donor bikes.

Lugs look too plain for a Peugeot, although some had pretty simple lugs. The mid and early 70s Peugeot had pretty eloborate lugs, even on bottom end bikes, not sure why.

I would guess a generic department store bike, with miscellaneous replacement parts. The lack of rivet holes in the head tube means either someone took the time to fill them in (doubtful) or it had some generic decal in the past (very likely).

Looks like a bike that meets your requirements. It doesn't have to be some high end classic to be a good daily rider.

The pic below is from my 1975 U08 (near bottom end Peugeot). Notice that the headset also looks quite a bit different than yours.