Alain,
thanks for your good words! I'll do my best to make this classificator as more or less reliable source

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Paul,
thanks for your comments! To say the truth, I pay no many attention to "L" designation indeed. Why? Since Fed-2 camera is cool rangefinder with interchangeable lenses, so every single version of particular camera could become "Fed-2L", if the I-61 lens is fitted

In my opinion, we shouldn't consider "2L" designation as very important issue in classifying of Fed-2 ... Indeed, for me it's much more important to know the whole evolution of particular camera.
Soviets have promoted the new "Lanthanium" lenses a lot, not only papers, even camera boxes have special markings "Lanthanium Optics". As we know, at least 3 Fed cameras (Fed-2, Fed-3 and Fed-4) were fitted this I-61L lenses initially. I have found an interesting picture of Fed-4 camera in Sovietskoe Foto magazine. Believe you or not, but there is camera with FED-4L markings in the picture ...

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So, .... more interesting questions arrising after your reply: 1} your camera #5
644.487 has bigger serial number in comparison with my #6
600.619 ... thought your camera was released in 1965, and mine - in 1966

Blank numbers were used to start with 6
600.000 both camera and lens? 2)you have mentioned the anniversary subsets of E1 type camera ... could you tell me more?
3) very important question for me. Why FED came back to old stock I-26M lenses in 1966, though they have arranged the mass production of I-61L lenses in 1964? And so on ......

Best Regards,
Aidas