Was the conversion done at Seecamp's shop? Pictures that I've seen of Seecamp-converted pistols show a small, oval "maker's mark" stamped on the frame. I've also seen a Detonics top end mounted on an ODI frame. ODI made a complete pistol(Viking)with the Seecamp lockwork built in. The main difference that I can see between a Seecamp conversion and an ODI is in the placement of the trigger return plunger; is the plunger retained by the DA trigger, or is a separate hole drilled in the roof of the trigger guard area? My impression is that Seecamp drilled the plunger hole after cutting-off the stock trigger guard, then welding-on the new, larger guard. To enable the design to be more easily rendered via investment casting, the ODI frame moved the plunger to the right side of the frame, where it is retained by the trigger. Of course, Seecamp also made the conversion available as a kit, so it's possible that "anyone" could have converted a stock Detonics; I seem to remember seeing some place that Detonics, for a time, considered offering DA as an option. Maybe they were working a deal with Seecamp, or a deal with ODI? Anyway, to answer your question, I'd say the gun would have some collector value if it was a) converted by Seecamp's shop, or b) was some kind of factory prototype or limited edition. If it is a parts gun built on an ODI frame (like the one I saw), its worth is as a shooter. If it was converted by a good 'smith, and the workmanship is good, then its still a shooter, but would have more value. In my a) and b) scenarios, I'd say the gun might be worth as much as $1000; maybe more if you had some proof of its origins. In the latter scenarios, it's probably worth no more than $500.