Thanks, Aidas.
In fact, my 1a in a plain one.
It was galvanized as others. Such are yours in the Wiki and the one that Bill shows on his site. If I'm right, Bill's one is # 5340, mine is 5330.
Very often owners added a clip on their 1a (I always wondered why the factory didn't do that by itself)to put an accessory. Then, as the collectors want original cameras now, the sellers remove the clip which leaves three holes more or less occluded.
Another problem is the lens. The original lens must be a "one turn". And its serial number should be not far from the body's one, and in small digits. Mine is 4534, a bit too old to be original but it's a 1a lens. A 1a body without its correct lens is not really a 1a...
Last thing: all my pre war Feds work perfectly, including this 1a. My post war 1f and g are often glued with that stick grease as hard as cement with age...

Now, I'm waiting for a TSVVS. But ssh... I will tell more only when I have it!
Amitiés. Jacques.