Yep, that's an ST touring frame. Originally came with 27" wheels but easily converted to 700C. No cantilevers until later in the 80's.

Spacing should be 126, but possible it's was more like 128 as 1) some 130 OLD hubs were out by then, and 2) with handmade frames there can be some minor variability from frame to frame. Later ones definitely were made as 128's to accommodate either 126 or 130 hubs.

Solid frame, makes a great foundation for almost any kind of bike, just don't expect to put anything larger than a 32 on it.