Anybody collect Chronosport chronographs?

I have just got myself another Chronosport chronograph bought slightly blind at an auction. This was a very nice surprise as it looks much better in the flesh than in the single picture (with no condition info) of the listing. It is in great condition except for the pushers that were jammed and a basic service was all that was required. The dial & hands are particularly nice, with crisp lettering and a golden glow to the hands (nickel plated?) at certain angles. The Landeron 248 is very smooth and show great specs on the Timegrapher. My other Chronosport has a Valjoux 7734 and the aeroplane logo. This one has no logo on the dial. I guess this one is slightly older. Would it be one of the Sinn ownership period watches?