Vendo serial numbers?

My Vendo serial # is F31255846, is this a true Vendo,  What's with the F instead of V?  The model is F39B.  Anyone, please help, thanks

Sorry the model is F 39 B

[dr galaga]

The following information is stolen from http://www.colamachines.com/vendo-serialnumbers.htm

Understanding Vendo Model & Serial Numbers
Model #  V stands for Vendo. The ab describes the vending capacity of the machine.
V44 =Serves 44 Bottles
Serial #  The serial number is typically made up of 8 numbers.
The first number is the year the machine was produced.
The second number is the month. (should read 2nd and 3rd)
The last 5 numbers are the actual serial numbers.
Example: Serial Number : 21014601
First number was 2 = 1952
Second & Third numbers were 10 = October
Which means that this machine was made in October of 1952and has a serial number of 14601.
 
Not sure about your "F" Scorps

My 63 has a SN of 807055935 (9 digits)  I just thought that in the 60's they just made the serial number portion longer.
Using the above formula mine was made in July of 1968.  It has woodgrain so this seems right.

Further comments?