Other than maybe a light clean I'd be tempted to leave it well alone and just use it.. its only original once. Condition shows it's clearly been loved and cared forI think it will sell on here if you're willing to wait. Also that way you'll be able to see pictures of any restoration.
Looks like T6G88888 as the code under the bottom bracket. One number is covered by the front derailleur cable
That looks more like 86 to me, which makes sense with the Bars. I'd be very suprised if someone doesn't snap it up soon!
Me too, it's an amazing bike! I'm back up in West London next week for a few days, but it's too big, so sadly it's off limits for me, but I do love the look of this machine and keep wanting it!I'm amazed this is still up. I would change the date in the OP to 86.