In recent years, finding gum-wall 'racing width' tyres for 27" wheels has meant recourse to dubious, crispy old stock tyres made in Yugoslavia or the USSR.
Thankfully, Panaracer have put an end to that, and their classic Pasela tyre is also now available in a 1" and 1 1/8" width in addition to the 1 1/4".
Classic looks, smooth rolling, and Tour Guard puncture protection, all at an affordable price.