Yesterday my latest "small serial number" Volna arrived, so I can now share some "research" photos. 5 have small numbers the last is normal, but from Q3 '58 as a comparison.A really rare watch. Notice the way how the serial number is stamped - only the earliest movements are like this. Congratulations!
The serial numbers appear to be not stamped as such, but very nicely engraved.
Sample from Q4 1957 with triangular stud.
Sample from Q1 1958 also with triangular stud.
Sample from Q2 1958 also with triangular stud. A bit dirty but purchased as a complete runner.
Another sample from Q2 1958 also with triangular stud.
Sample from Q3 1958 most likely the triangular stud has been replaced (different clip too). A "franken" watch which I only bought for the small serial number movement.
Another sample from Q3 1958 also with triangular stud but the bigger (normal) serial number.
Not sure what the significance of the smaller number is/was.
Maybe one day we will have an answer, or maybe we are over thinking the whole thing
Either way the 2809 is a beautiful movement, in any combination.