I have some new-old-stock Trelleborg 27 x 1 1/4 tires but I see no model listed and I don't know what size the ones you're looking for are. The other sidewall markings are "to fit BS rim K2", "2896-1", "inflate to 50 to 60 lbs", and of course "made in sweden". Don't know how close that is to what you're looking for, but they'll be around if you want them.

And since I can't let a ̶g̶o̶o̶d silly joke go unused, isn't Trelleborg's slogan "rolling resistance is futile"?