In 1950 a new system for the date coding was introduced where the two digits only indicated the year, not the quarter hence "50" means made in 1950, this system was used in the US until 1955 and in Canada a few years longer..
It has been assumed that Parker began marking some of their pens on the trim or cap bands to allow for dating in 1970.
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The first date codes, found for example on the Vacumatics, consists of two digits, the first one denoting the quarter of production, the second denoting the production year.
In mid 1934 Parker began marking most pens and pencils with a date code, both the barrel and the nibs were marked, but lacking a date code doesn't necessarily mean that the pen was made pre-1935, since many imprints have been worn off with use.
Page 1 of 2 - Where Are The Date Codes On A Parker 51? MKI was a Vacumatic filler, this model was in all aspects identical to the standard Parker "51" but with a shorter barrel and cap.
- posted in Parker: Greetings all, I was looking over my Parker 51 Aerometric out of curiosity; to try and find out when it was made, but I couldn't find a date code in a ladies size Parker "51" called the Demi "51" was introduced. Some dating aides can be found under the Parker “51” Chronology page.
But to reach a 93% visual accuracy compared to traditional gold plating, Parker uses a 3 micrometer layer of which 0.4 micrometer is 14K gold.
MKI parker a south african dating site scams filler, this model was in all dating identical to the standard Parker "51" but with a shorter barrel and cap.
There were no double jewelled Demis produced either.
Possibly anticipating the 1980 official start of date coding in France and the UK, this could have led to the presumption that the dating actually began in 1970, but proof of this has still to be found.
The quarter marker changed in 1988 from E, C, L, I to III, II, I or none (last quarter) according to the below table.