There seems to be considerable variation with the Epsilon shutter itself considering they are all the same #0 compatible fit. There was a three speed version that I assume was renamed as the Trikon, then some with a top speed of 1/150 (as in the photo above) and oothers with a top speed of 1/200, 1/250, 1/300 and 1/400. My 820 Xpres has the 1/250 version (again in a photo above)

Then there's the slightly different Kodak Epsilons, 1/150 top speed.