Personally, I think the binocular is original with a replacement back plate.
When the serial numbers have, say, 78 followed by another number, that number may be the month.
In this case because of the zeros I think that it may be the 6602nd binocular of that type made in 1978.
This wouldn't surprise me if it is the 7x50 as many were made and they have a good reputation.
I am not certain if every binocular type had their own serial number list or whether say 7x50s and 10x50s were included in the same listing.
With Dallmeyer lenses, each one was listed in enormous stock books with hand written date of manufacture and serial number. There were many volumes, which I went through.
Some British WW2 lenses had no numbers and no maker's name as they were produced in large volumes and had very poor quality alloy mounts.
There were vast differences in resolution as they were made in great haste.
The Taylor Hobson lenses were generally better, although the associated NOC, National Optical Company, mainly made in shadow factories were more variable.
Taylor Hobson lenses are marked TT followed by the serial number.
(The Dallmeyers were usually VV or UU followed by the serial number}.
So, at a guess, with the 7x50 KOMZ, at least 10,000 may have been made per year for many years.
It may also have been supplied to the military.
Export versions were usually of higher quality than civilian home models.
I have no idea really, but there may be over 100,000 Soviet 7x50 Porroprism binoculars.
They are basically hand made the old fashioned way.
I presume yours is single blue coated but maybe on only a few surfaces.
The Russian months maybe the same sequence as ours, but Japanese production months used to start in April, with only ten coded digits, which meant that the January numbers included February and March.
Also the year digits repeated every decade, but one could guess from the camera model when it was made, but not always.
Leica camera accessories may have hundreds of different codes, so the total number of optics codes may be even a thousand.