Casio SP-410

Timing Data

This watch was spec'd to 15 SPY but is currently performing at about 68 SPY. This makes it the worst of my 4 MHz watches and possibly the first of my Casios to suffer my attempts to trim it. It is, however, the best-performing of my 4 MHz watches in that its rate has been almost rock steady.

Day Deviation SPY Correction
0 -0.174 0  
20 3.566 68.2  
61 11.262 68.4  
88 16.334 68.4  
96 17.868 68.5  
105 19.582 68.6  
111 20.546 68.1  
117 21.566 67.8  
124 22.764 67.5  
130 23.77 67.2  
137 24.06 64.5  

Graph showing trends in deviation from Standard Time (in seconds) and rate (in seconds per year)


A Note on the Accuracy and Reliability of Timing Results

There is always going to be an unknown margin of error in any method of timing, and I estimate that each timing event could be off by as much as 0.1 second (though in practice I believe my results to be somewhat better than this). As a consequence of this potential margin of error, results over short periods of time are unreliable. Ultimately, the only result that matters is that which comes at the end of a full 365 days. Where interim results show consistent timings or steady trends, however, then it is safe to assume that those results are fairly accurate.