My August 1976 Mk IV. It remains a mystery to me as it's got the proper Blue Mink/Silver paint under the one you see - a lighter shade of blue. What you see looks much more like the darker Steel Blue that they put on the Mk Vs. No sign what-so-ever that it ever had factory decals but the stock Mink Blue is where it belongs (the original paint was never stripped off). All the lining looked like the Worksop hand, I've over lined it as much of it was missing. And the HT lugs are Bocama Super Professional long point lugs - never seen them on another Mk IV.
No collectors item, a rider and I love it. Great bike. I'm very luck to own one. Great thread too!!