I have this Commando that I bought from a coworker (a different one than sold me my SAA - work is good LOL) and I'm wondering if it's worth paying for the historical document from Colt. Is there an age or condition where the consensus is to get it lettered every time, or should it be based off of what you can find out over the phone? I've got $100 tied up in this one, and don't have a good idea of the value, so I don't want to go in the hole paying for a letter that may not mean squat in the big scheme of things. I know it's worth it for the SAA, but just can't make up my mind on this one. My other problem is that I can look at values in the book all day, but I'm not sure what percentage I'm dealing with here. I'd be happy for some ballpark figures and explanation if anyone can provide it. Thanks!