Vintage Avedis A. Zildjian 13” New Beat Hi-Hat Cymbals - Top/Bottom - Pair/Set - Pre-Serial Late 1960's Tall Stamp 

746/880g - Light Top/Medium Bottom - First Generation New Beat Hi Hats

The A Zildjian New Beat Hi-Hats were introduced in 1968 and still remain in production today. 
These cymbals have the Pre-Serial 1960's tall stamp that Zildjian used in the late 1960's. 

So these are most likely from 1968 or 1969, the first generation of the New Beat Hi Hats, which had a light hi hat top and a medium bottom. The New Beat Hi Hats they make today have a medium top and a heavy bottom. 

The hi hat cymbals are in very good preowned vintage condition for their age. No cracks, key-holing, damage or issues. The hi hat cymbals have a nice vintage patina. No logos. The cymbals have some faint spots, a couple minor scuffs and scratches and some fingerprints underneath. 

I will post a video with a sound file shortly.. 

Any questions, message me.