It could be "The Classic Hunter", which the 3rd ed. SCSW describes on page 201 as "Lew Horton Special, Model 29-3, 6-shot non-fluted cylinder, 6" full-lug barrel, adjustable four-position front sight, white outline rear blade, blue finish, Hogue rubber combat grips, N target frame, square butt. Product code 101230; 5,000 manufactured in 1987." That's just my best guess from looking at your picture.
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