Locating an original 44m-7 can be a bit of a minefield. There is a lot of info that can be found via a Google search.
Example; taken from:-
New old stock Helios 44M-7 lenses
PostPosted: Mon Mar 06, 2017 6:08 am
"Unfortunately, version 44M-7 is rarely found even in Russia. I bought a copy for about USD 20 (if converted at current exchange rate) in mint condition with the camera.
In Russia, the price of different versions are practically identical. The reason is that here everyone knows - in the case of Helios lenses the quality is not determined by the numbers on the body Smile It can be very bad genuine 44M-7, and very good 44M-5. It can be very good 44M-7 and very bad 44M-5, 44M-6, and so on. It is a matter of luck. So I always advise to check Helios lenses before purchase (regardless of version), or buy only from familiar.
And another common misconception. Many people think that first produced 44M-5, then 44M-6, then 44M-7. This is absolutely not true, it's not chronological numbering. All these versions were released simultaneously. The lenses were tested, and, depending on whether the resolving power was at each particular instance, it is assigned an index of 5, 6 or 7. Thus, version 44M-7 - the best on the lines per mm parameter. Theoretically Smile In practice, it depends on many other factors. For example, how much was drunk worker who made the lens. My copy 44M-7 much better the original German Biotar. But I have met and utterly horrible copies of 44M-7 (not fakes!).
44M-7 with 8 blades - it is 100% fake. But not the fact that it is a bad lens, if you're lucky, it may be better than the genuine 44M-7.
44M-7 has ONLY six blades and NOT have switch A/M. 44M-7 was produced in only one plant (Jupiter in the city of Valdai) - logo in the form of arrow with the circle. The first two digits of the serial number, usually 91, 92, 93 (years of release). Front ring with lens name may be of metal or plastic (plastic - not a sign of a fake, it is a normal feature of the later copies, attempt to reduce the cost of production). Weight - 270 grams (early Helios, such as 44-2, have less weight).
In addition, there are two different lenses with similar names - Helios-44M-7 and Helios-44-7 (rare lens for Zenit-7 camera only). Do not confuse them.
Greetings from Russia."
As always with these things, research is crucial. A smattering of good luck also helps.
Good luck on your search.