I found information about this brand is quite rarely compared with other brands, some information found even wrong on internet, just now was seeing a really good stuff about the Certina serial number, i wanna share it here, hope it may be helpful.Certina serail numbersBefore 1958 the serial number could look like this.8600-2, 1600756.I'm not sure the caliber information is in the number as it all over the place and I have not been able to get any real information to break it down, and there were some models that had different serial numbers and some that only hada the production number.1958? - 1974This is how a typical serial number looks like from this period.5806.135, 499399358 is the caliber, 06 is the type of metal used in the case, 135 is the case style and 4993993 is the number of watches made.There was an overlap of the old serial numbers and the new ones sold in 1958 but I don't know how long after 1958 they sold old stock.Movement04 Cal.

13-2206 Cal.08 Cal. 13-20 or 13-2110 Cal.11 Cal.17 Cal.

17-2518 Cal.19 Cal.20 Cal. 19-55 pr 19-3021 Cal. 320?24 Cal.26 Cal. Automatic27 Cal. 17-01129 Cal.

32430 Cal.34 Cal. 12-1038 Cal.40 Cal. 23-20 or 23-3041 Cal. 25-36, 1960+ or 26-66, 1960-197752 Cal. 25-66, 1960-197753 Cal. 25-661 or 25-661 M (-M), Date, 1960-197756 Cal. 25-45, 1951-1960 or 25-451, 1951-1960 or 25-65, 1960-197758 Cal.

These models typically have short, 3- or 4-digit case serial numbers that obviously do not conform to the standard 7-digit format. The serial numbers on these watches do not appear to have any date correlation, leaving the movement as the only method for dating the watch. An example of this type of watch is the 1942 Watertite.

25-651 1960-197759 Cal. 25-652 1960-197763 Cal.

25-02168 Cal. 25-01170 Cal.

28-10, 1965-1970?71 Cal. 28-1672 Cal.73 Cal.

28-163, Biorhythm, 1965+75 Cal. 28-353 (ESA 9154), Electronic, Bbiorhythm, 1971+77 Cal. Electronic81 Cal. Electronic or 321, 28-15?82 Cal. Electronic84 Cal. 29-053 (Valjoux 23), 1974 or 29-063 (Valjoux 236), 197485 Cal. 29-053 (Valjoux 23), 1974 or 29-062 (Valjoux 726), 197486 Cal.

29-0531 (Valjoux 232), 1974 or 29-0631 (Valjoux 234), 197487 Cal. 29-064 (Valjoux 728), 1971+ or K.F.320?91 Cal. Quartz92 Cal. Hello there I'm the one that have made the effort to try to find out about Certina serial numbers and it's nice to see that there is some interest as it's a great brand and now we can put a year to watches from the start of production up to 1974.I have updated the list and you can look at it here.I made it in plane text so it's easy to make your own document with it as you wish.Here is how the serial numbers correspond to the year of manufacture as it stands now and should be good enough for normal dating of watches. And boy do people get the year wrong.:-)1938, 0'0, 0'1, 0'2, 0'3, 0'4, 0'5, 0'6, 0'7, 0'9, 1'1, 1'3, 1'5, 1'7, 1'9, 2'1, 2'3, 2'5, 2'7, 2'9, 3'1, 3'3, 3'5, 3'7, 3'9, 4'2, 4'5, 5'0, 5'5, 6'0, 6'5, 7'0, 7'5, 8'0, 8'5, 9'1, 9'700'000.

Look for a date code stamped on the back of the case. Take your watch off and flip it over to look at the smooth metal back of the case. You may see several different markings engraved there, all of which have different meanings.

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A date code will be either a symbol (like a triangle, and eight-pointed star, or a half-moon, for example), a two-digit number, or one letter and one number. X Research source. You may need to use a magnifying glass to help you read the codes, as they are very small.

If your watch was produced earlier than 1924, it will not have any date code on it. You may also see a serial number on the back of your watch. This can also be useful in helping you identify how old your watch is, but it is not the model number. Interpret the date code. Once you have identified a date code on your watch, you will need to interpret it, as the date is never printed in an obvious way. Bulova has used a few different systems for dating their watches.

X Research source. Between 1924 and 1945, a series of symbols was used to indicate the year in which the watch was produced. If you see a symbol, do an internet search to find a table that will show year which year corresponds to which symbol. Be aware, however, that some symbols were used more than once. For example, a circle was used in 1925, 1934, and 1944. A transitional system was used between 1946 and 1949. In 1946, the code was 46 followed by a square.

In 1947, the code was 47. In 1948, the code was 48. In 1949, the code was J9. Beginning in 1950, Bulova started using a code including one letter and one number. The letter indicates the decade, while the number indicates the year within the decade. The decade codes are as follows: L = 1950s, M = 1960s, N = 1970s, P = 1980s, T = 1990s. For example, if your watch is stamped with the code M8, this means your watch was produced in 1968.

If it is stamped with the cope P0, your watch was produced in 1980.