Colt's records, R.L. Wilson's The Book of Colt Firearms to name a few.
Find them at proofhouse.com.
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In 1849, production of the Colt Pocket Percussion revolvers began. Below is a link with a short history of the Pocket Colt.
value depends on overall condition...............
The 1851 Colt revolver, also known as the Colt Navy Revolver, did have serial numbers, although the practice of serial numbering was not as systematic as it is today. Colt began marking their firearms with serial numbers around 1850, and many 1851 models feature them, but not all. The absence of a serial number does not necessarily indicate a counterfeit or replica, as early production methods varied. Collectors often use the presence and format of serial numbers to help date and authenticate these revolvers.
Check the Blue Book of Gun Values, Stanard Firearms Dicitionary or proofhouse.com 1903. Colt single action revolvers in 1903 started with serial number 238,000 and 1904 serial numbers started at 250,000.
double action colt revolvers 1905 - 1978 Serial # 507493 made about 1925
Go to proofhouse.com for Colt combat commander serial numbers.
Serial numbers dont go that low on Offical Police revolvers. Need to know caliber,barrel length,barrel markings,etc.
Late 1969 is what it appears to be by number. No serial number site concerning Colt revolvers lists any preceding letters like "A".
You will have to get it lettered by Colt to find out who it went to.
You need a professional appraiser