The 25-2 is a .45 ACP revolver, for the most part. There may have been a very few in .45 Colt. Probably in a 6 1/2 inch barrel. The .45 Colt guns were the model 25-5. They were made in a 4 inch barrel as well as the 6 inch barrel. I have a 6 inch in the N800000 range. These guns are noted for oversize cylinder throats.
If original, the right side of the barrel should read .45 COLT CTG.
Depending on condition, I would say a fair price is around $700 or so. Gun prices fluctuate by region, so some areas it may be closer to $900.
Well, it still looks pretty nice! But I sure like .45 Colt better.
But the other side of the equation is, that for a shooter, .45 ACP ammunition is much more readily available, cheaper, and is capable of doing anything that the .45 Colt cartridge will do. The whole idea of the .45 ACP was to make more efficient use of smokeless powder in a smaller-capacity case than the .45 Colt, so as to meet or exceed the ballistics of the black powder .45 Colt load. The .45 Colt case is significantly less efficient than the .45 ACP when loaded with smokeless powder due to its larger volume.
The difference in chamber pressure makes up for the difference in mechanical strength in the guns. The .45 (Colt) just isn't quite as strong mechanically as the .44 magnum in the cylinder, but in turn the .45 does any equal amount of work with less pressure. It all balances out.
.45 ACP ammunition is much more readily available, cheaper, and is capable of doing anything that the .45 Colt cartridge will do. The whole idea of the .45 ACP was to make more efficient use of smokeless powder in a smaller-capacity case than the .45 Colt, so as to meet or exceed the ballistics of the black powder .45 Colt load. The .45 Colt case is significantly less efficient than the .45 ACP when loaded with smokeless powder due to its larger volume.