It is hard to say based on the info you have given exactly the age of the Titan 25 cal that you have. From my understanding they were manufactured between the late 60's and the late 70's. They were manufactured in Italy and distributed by at least 2 companies EIG and FIE, EIG imported them before 1968, and FIE after that date. So that should at least give you a rough idea of the age of the gun you have. I found a spattering of forum posts about the Titan 25's by doing a Google search. Here is one that give a little detail about the EIG version of this gun: http://forums.gunbroker.com/topic.asp?TOPIC_ID=67712.
DO NOT ATTEMPT TO DO THS!!!!!!!!!!!
A Titan .25 caliber pistol typically has a magazine capacity of 7 to 9 rounds, depending on the specific model.
A Titan 25 caliber pistol is worth between $75 and $200 depending on its overall condition. These small caliber handguns are designed for close range protection.
20-100
Like a Colt 25 auto
25-60 USD or so
100 USD or so if NIB
Try gun shops, gun shows, want ads,
50 or so. ADDED-$200 for a mint steel frame Titan & $150 for a mint alloy frame Titan. (magnet will stick to steel frame).
gun shops, gun shows, want ads, e-gunparts.com
Titan brand .25 caliber handguns were made by Tanfoglio, an Italian gunmaker. They use proprietary magazines. Some other .25 caliber magazines from similar handguns may fit, but there is no recognized interchange and no guarantee that a mag that fits will feed correctly. Your best bet is to look for a Titan/Tanfoglio mag at a gun show or a used gun parts dealer like Numrich.
No published sn data