Thanks! I'm waiting with bated breath. For the comparison AND the pictures! (pics are blocked at my work)
Well done and thank you for another excellent series.Now, that we have seen all the pictures what does it all mean? And, how does the ST18 compare to the ETA 2892-2? How good a movement is it?
The ST18 compares very well with this ETA 2892-2, the finish and workmanship of this ETA is similar. The Seagull has some minor alterations to reduce the cost of manufacture. Now, we must remember that this is not a current 2892A2, one of the top-of-the-line automatic movements produced by ETA, but apparently a one made some twenty years ago. This 2892-2 was likely the second level grade, the Standard (now it would be called Elabore grade), judging from its balance, which seems to be gilt-nickle, not glucydur.
Both movements, after re-assembly, were timed and regulated. This was done fairly swiftly, as the movements were fairly good in positional variation. The ST18 ended up +8.4 s/d, with a positional variation of about 5 s/d, the ETA about -0.4 with a positional variation of about 4 s/d. They were both very stable.
The ETA 2892-2 design (and the 2892A2, as nothing major has changed) is not in my opinion superior to the 2824-2. Other than being a slimmer more compact movement, it has nothing I can see that would give it an engineering edge over the 2824, and several things that I think are weaker.
The click of the 2892 is a very small thin spring that can slip off the intermediate crown wheel, it is not the use of a spring as a click that I dislike, the ETA 2850/2870 series also uses a spring as a click, but the 2850/2870 this part is a short stiff spring that cannot flex and slip off it gear.
The 2892 has about 10% more parts, most small gears used to link parts that where separated by the need for thinness.
The 2892 does not disassemble and re-assemble as easily as does the 2824.
The fact that ETA has placed the 2892A2 in the Mecaline Specialites line (the high-end line), and these are more carefully made and better decorated than the Mecaline, is all that keeps the 2892A2 ahead of the 2824-2. Personally, I prefer the design of the 2824.
Similarly, Seagull may have placed the ST18 in a higher prestige tier than the 2824 copy, the ST2130, as this movement does appear slightly (if very slightly) better finished than the ST2130 I looked at a few months ago.
Done.Well done and thank you for another excellent series.
Hopefully gigfy will put these valuable posts into the reference section :-!
Excellent post lysanderxiii. I wish I was a watchmaker so that I could fully digest these technical posts. I'm picking up more and more thanks to you. You do a excellent job of explaining your points so everyone has the opportunity to learn something new. Thank you. :-!