Hi Oppy.....welcome to TFF.
We can give you a "ballpark" estimate of it's value here, but we need to know which model & grade of the 742 you have. ADL? ADL DeLuxe? BDL? BDL DeLuxe? Peerless Grade? Premium Grade? Any engraving? Type of checkering?
If you could post some pix....full length, right & left sides, and closeups of any engraving, it would sure help.