ctg is short for 'cartridge' as in 357 cartridge.
Proofhouse.com has sn data.
Between $300 and $475.
40-400 usd
value depends on overall condition................
50-500 uSD
100-400 USD depending on condition.
About 1968/1969.
where do i fine serial number on acolt trooper 357 magnu .I lookes on the frame and but and all it says it 357 magnum ctg.
It will be marked on the weapon.
100-700 USD
Proofhouse.com has Colt sn data.
The .357 part of the name means that the bullet diameter .357 inches. I do not know what the "Magnum" means in the name.