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Discussion Starter · #1 ·
So I was trying to figure out how to tell approximately which "month" a particular python was produced using production number and straight line averaging. During my investigation I found this nice picture showing years and production number ranges (https://www.calguns.net/calgunforum/showthread.php?t=217494) . If you use the number and interpolate 1/12 made per month on average, you can approximate what month a python was likely produced.

Colt Python Date Ranges.jpg

For example, I am looking at a 1965 python with serial 43142 with a test target signed 3/29/65. Based on interpolating for 1965 start (41400) and finish serials (50499) with number of pythons made (50499-41400 if assume they didn't skip any) at 9099 divided by 12, that's about 758 a month. So January of 1965 numbers likely from 41400 to (41400+758) or 42158. For February, 42148+another 758 would be 42916. For March, 42916+758 is 43674. That means my 1965 with serial 43142 likely made in March 1965 (which coincides with dated test target). I'll go one step further to estimate the actual date it was made. For march 1965, start and end numbering (again assumptions here) 42917 to 43674 range. For march of that year there were 23 work days and no holidays (excludes weekends) gives about 33 pythons per day made in March 1965. Interpolating further, mine was made approximately March 9th, 1965 which meant it wasn't test fired for another almost 3 weeks.

Fun exercise and kind of makes sense based on test target and serial. Enjoy wrapping your head around yours for the month made!


1965Day of WeekMarch
42950Monday1
42983Tuesday2
43016Wednesday3
43049Thursday4
43082Friday5
43115Monday8
43148Tuesday9<<<43142
43181Wednesday10
43214Thursday11
43247Friday12
43280Monday15
43312Tuesday16
43345Wednesday17
43378Thursday18
43411Friday19
43444Monday22
43477Tuesday23
43510Wednesday24
43543Thursday25
43576Friday26
43609Monday29
43642Tuesday30
43675Wednesday31
 

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Sweet! I like doing these statistical exercises too. Who knows how close to reality they are but you never know.
 

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been my experience based on colt letter ship dates that the above excercise is fruitless..........but build and test dates could be a better indicator but the rareity of real targets with pistols makes it a tough find for sure
 

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Were allowances made for St. Patrick's Day and Ash Wednesday and the number of Irish employees/wannabes on the Python line?
 

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Discussion Starter · #5 ·
Were allowances made for St. Patrick's Day and Ash Wednesday and the number of Irish employees/wannabes on the Python line?
No I did not account forr those days- I found out when Easter was in 1965 but did not consider St. Pats or Ash Wednesday. Good idea tho if those were holidays/days off back then.
 

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I like and appreciate your research. I was doing some rough interpolation of my own( very generalized)
Python production years (1955-2005?) roughly 500,000?divided by 50 years= 10,000 year divide amongst
50 states=200 year/per state. Of course we know states don’t have the same population but there are a
lot of gun owners in every state. Knowing that some owners own more then one, not hard to see why in
the present year it can be difficult to find one, especially if you are in a state where supply is limited to what
is available in that state ie. CA where we can’t bring a Python from outside CA ( unless it’s 50+ years old).
 

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Looks like year 1966 might be incorrect. If 1967 numbers begin with 61,000, then 1966 should end with 60,999 (not 59,999). If that's the case, there's 1,000 guns unaccounted for. My list from a colt book shows 1966 numbers 50,500 to 59,999. Of course, math was never my favorite subject in school. So someone needs to verify.
 
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