Interesting - I have a '72 "Grand Sports", same thing really though Raleigh tweaked the name a few times on that series. This one is not bad but the crank looks '80's to me, I might be off-base on that. The fork doesn't look original to me. MIne also has the hanger on the dropout, this has an add-on claw, it may have been drewed.. Regardless, a decent buy at $50. You could do a lot with this one, and the Lagoon blue and white paint scheme is so cool and distinctive.
Definitely not original crank, and must have changed the BB with that, because that crank requires a more narrow spindle than the original - either that or he has bad chainline.
The Crane RD is what it is - it was put there for wider gears and chain wrap.
Tad just replaced the later 600 version of that RD with SunTour - well, because it was smart and works now.
Gran Sport was the lowest-equipment-list Carlton-Raleigh using butted 531, and also had a low-trail fork (ala Grand Prix and International)
Thanks for confirming, crank definitely looked anachronistic to me. I'd venture that the Crane RD and the Suntour barcons on their own are probably worth the ask based on current pricing. I have no need since I have one already but I'd probably check into it anyway if it were in my area.