I have 1989 specs for this model that match your description. Tubing is seamed Tange Infinity CrMo with CrMo fork, stay material not mentioned. Exage 12 speed drivetrain and brakes. Centurion hubs laced to Araya SS45 rims. Avenir Racing gel saddle, Kalloy stem and Centurion handlebars. Claimed weight of 25 lb. MSR of $370 US. A sport/touring model on the cusp of low and mid range.
Your model could vary a year or two from this, so if you what a better idea, try matching the component date codes with the info on the Vintage-Trek website.