Vendo Identification Guide 
Model # V stands for Vendo. The ab describes the vending capacity of the machine. 

Example

V23 is a machine that holds 23 bottles and the V81 holds 81 bottles
Serial # The serial number is typically made up of 8 numbers. The first 3 numbers are the date the machine was produced. The last 5 numbers are the actual machine serial number.

Example

20513704 means that the machine was made in 1952, in May, and has a serial number of 13704
Color Format Typically, machines that have a white top mean that they were built from 1956 to 1959. Machines that are all completely red were built before 1956. Sometimes, since machines were re-painted, this color coding will not always be true.