Parker 51 solid gold presidential fountain pen from UK

PARKER 51 SOLID GOLD PRESIDENTIAL FOUNTAIN PEN 

This is most prestigious pens ever produced by Parker in the UK, they had a policy of producing a 'Presidential' version of all their top line pens and they were usually available in either 9 or 18ct gold. The American equivalents were made from 14ct gold so it is easy to tell the origin from the gold content. 

The Parker "51", solid gold offering is called the "Presidential", while a.1/10 14k gold filled version called the "Signet" (later known as "Insignia"). In terms of gold content in the different versions, use the 1/10 as your guide. I believe the Presidential had a smooth gold cap & barrel finish, whereas the Signet had a vertical line design on the cap/barrel. The UK versions were 18k and 9k Presidentials and a 9k rolled gold (i.e., gold filled) version.

Signets are not very common, but certainly far more common than Presidentials. The gold cap and barrel (whether solid or gold filled) was only offered in the Aerometric series as a regular production offering, not in the earlier Vacumatic line.

This is a NEAR PERFECT EXAMPLE OF A FACTORY MADE CLASSIC VINTAGE 1960'S PARKER 51 WAVY LINE DESIGN 9CT SOLID GOLD AEROMETRIC FILLING FOUNTAIN PEN, FULL ENGLISH HALLMARKS "PPCo" PARKER PEN COMPANY, DATE LETTER "i" FOR 1964. ALL IN ITS ORIGINAL GREEN MOROCAN LEATHER PLUSH LINED BOX. HAS A SHARP FRESH LOOK TO IT.  PROFESSIONALLY ENGRAVED "K.N.B".  THE PEN MEASURES JUST UNDER 5 1/2 INCHES (13.8 CM). CAP LIP IMPRINT "PARKER 9 .375". BARREL HAS FULL HALLMARKS AND "MADE IN ENGLAN". FULLY WORKING, AND TESTED COMES WITH AN ORIGINAL FINE/MEDIUM GRADE 14CT NIB .