Bought it from a thrift shop because it was cheap and I didn't have already have a Petri SLR. Somewhere I swear I have a 7S rangefinder but I'll be damned if I can find it.
I don't know much about this one. Petri was one of the japanese makers that never really took hold in the USA. By the end of the 1970s they'd disappear entirely.
In an advertisement they describe this as the little brother to the automatic FT EE model; this FT II has match-needle metering instead. Both use Petri's proprietary bayonet lens mount, which I think is close to Canon's breech-lock system (i.e. you push the lens on straight and give the silver ring a twist). Like Miranda and Praktica, they put the shutter button on the front panel instead of the top. The controls are clear and easy to understand, and it's got a hot-shoe, which was still an "accessory" on a lot of cameras from this era.
In 1974 Petri changed the mount to the M42 thread mount, relocated the meter stop-down and ASA dials, and called it the FTX.