Date: 1972, owned by David Oliver
The 77H Connquest isn't listed in the Conn Model number list, however it does exist. It was made from 1957 to at least 1974.
What Conn said in 1957:
Scientifically designed and built with acoustical qualities to delight the musical conductor as well as the student player. Crysteel airfloat slides provide smooth, fast and dependable action. Same professional style balancer as in the most expensive models. Length 46", weight 3 lbs. 3 oz., bell diameter 7 1/2".
Highly polished brass, beautifully nickel trimmed, protected by longer lasting, acid-resistant LUSTRE-CONN finish. Also available satin silver plated, brilliant gold bell.
What Conn said in 1966:
The "professionalized" instrument for students. Provides big, full tone in all registers. Brass bell. Bore size .500". Bell 7 1/2". Length 46".