manufactured by a German company called "Preh".
There are two sets of numbers on the pot.
As seen here, the first set that says 500K refers to the resistance value of the pot. You will also find pots marked 250K, in fact they are more common.
The second set of numbers tells us the date that the pot was made. It does this by week number and year. The last digit is the year and the preceding 1 or 2 digits represent the week during the year.
The pot shown on the right was made in week 22 in the year 1966.
This appears to apply to years from 1960 to maybe 1973 after which time the design of the pot was changed and the dating code lost.
For years between 1970 and 1973, we need to look at the pickup type. If the Pup is a "Blade" type then the pots are from 1970+
They look like this from the underneath.
The very lovely "Toaster" pickup. Why toaster? Just look at the slots in the top!
According to the serial numbers that I have recorded on this site, guitars with the numbers from 313 to 460 are fitted with the Toaster pickup.
These guitars were shipped to Selmer UK during 1960 and early 1961.
The "Diamond" pickup was fitted to guitars with serial numbers 543 to 1771 and covers the years later 1961 to mid 1963
For more information about the diamond pickup have a look here
"Staple" pickups were fitted to the end of the run of Venetian shaped bodies, and for the first two years of production of the Verithin "66".
On this site the numbers are from 1821 to 3992 and cover the years from mid 1963 to 1965 when the Florentine '66 was introduced.
Blade pickups were fitted to the '66 Florentine guitars and to the later Verithin bass guitars.
They were produced from late 1967 to at least 1971.
The numbers for the '66 run from 1000 to 1411.
