OMAS 360 YELLOW WITH TWO TONE FINISH - SPECIAL 75TH ANNIVERSARY EDITION

This Omas 360 in yellow resin is a very unusual special edition which shows the date 01/07/2000 on the back of the cap. The pen is fitted with a 75th Anniversary M nib ( 2000 is the year when Omas celebrated its 75th anniversary of activity).
The unusual aspect of this pen is that the thin ring on the cap and on the section is rhodium-coloured while the large cap band with the greek key decoration is gold filled.
I got the pen form a Spanish collector and it appears to be a special edition made for the Spanish market only, but I do not have any documentation about it.
The pen is second hand but in excellent condition. It comes without box.