WOW !! Fantastic and seriously rare in 18K with "Stardust" dial.Interesting section on this calibre on Piotr "crazywatches" site. The beautiful Aventurine dials are all individual and came in varying colours,blue,grey,green,orange,yellow,gold/brown, often suffering from stress cracking. Bracelet looks the same ref as the 18K TC1 ??
Regarding numbers produced (18k only), Omega usually only release figures for calibre production not individual variants, my guess 100-200 units. Omega were in the habit back then of producing the first of a new calibre in 18K only, and for some strange reason used to produce in batches of circa 50 units - usually entrusted to Fontana in Italy, not Star as you might expect (some sort of prohibitive tax,import problem perhaps ??)( 18K TC1 initial order =60 units, 18K Electroquartz -the predecessor to the Megaquartz, initial production =42 watches,all 42 sold before the end of the 1970s Basel fair at 5,400CHF ea )
Also keep in mind, vibrating at nearly 2.5 million times a second, compared to a standard quartz watch ,this was like a race between Usain Bolt and Stephen Hawking
Here's how spectacular the dial can look if you catch it right