A few hundred to a few thousand depending on EXACTLY what you have, its condition, box, accessories, papers, age, history, etc..
You will need to call Colt to find out.
your colt gold cup national match would be worth between 650 dollars at 70% condition to 1,000 dollars at 90% condition.
the original colt gold cup 70 series is worth about 1,000 dollars roughly
Your colt delta gold cup is going for between $900 and $1600 dollars depending on condition where your located, and how bad you want it.
There is no way to answer since you did not provide a serial number. You can call Colt and they will tell you. The Blue Book of Gun Values has sn data as does the Colt website.
The caliber of this weapon is .45 ACP, or it's full name is .45 Automatic Colt Pistol.
where was the colt gold cup national match serial #70n51714 made
100-1000 USD
The Colt Gold Cup NM .45 with serial number 15051 NM was made in 1965
Colt data at Proofhouse.com
Your colt gold cup was made between 1977-1983.
100-1000 USD