My experience w/ Colt Customer Service, regarding DOB, of my recently acquired Combat Commander, was not very helpful IMHO.
I have a Combat Commander, w/ a 70BS30xx. Looking at proofhouse.com chart, I believe my Colt is from 1970 - 1972 (70BS01001 - 70BS06501). The leading "0" is confusing:bang_wall:.
Since I couldn't pinpoint the exact year, I called Colt C/S, and finally got thru & t/t Rick, after 3-days trying. Gave my serial # & he returned telling me, my pistol was made "
approximately 1975." But, he didn't seem to sure of himself. I mentioned "Proofhouse", stating "My Commander appears to fall within '70 - '72 range." His reply, "If you want to confirm it, you can request the Archive letter, for $100 buck." He seem 'taken a back' by my questioning his response.
I believe my Combat Commander was made in the '70 - 72 range. I'll pick "1971" since its right in the middle.
My experience was not the best. Otherwise, Colt firearms are top notch. I have four in my collection. (Agent, w/ hammer shroud (2nd version), SS Gov't .380, Argentine Contract 1927 & now, .9mm Combat Commander)