Vintage early 1990’s curtlo mountain bike frameset. Measures 16” center to center with a 21 1/2” top tube. Fillet brazed. I spoke to Doug curtiss (the builder) and sent him pics. He said is likely true temper OX2 tubing from the early 1990’s. 1 1/4” steerer. Manitou bulge FS Ti spring fork. Dia Compe aheadset aluminum 130mm stem. No dents or cracks. Normal wear and tear. It’s been in storage for 20+ years. Great riding bike!