I got this old leather saddle from a garage sale. It is old and dirty. After I clean it up, I can't see any branding mark at all. The leather is thick from 5.5mm to 6mm. I think it is a good quality piece. Anyone knows what year and which brand is this leather saddle?

My guess would be it is a Brooks B-15 off an early 1970s Raleigh. Cancel that as the rear of the rails on most Brook's saddles are welded not bolted on. Roger

My Fuji Belt has very similar items.
The rails are bolted on, except the spirals start on the other side of the bolt.
The leather has a relief around the perimeter just like yours.
The bag tabs have the same "D" shape punched out like yours.

Here's a few photos to go with my earlier post.

Looks like a French market saddle that may have been original to Gitane / Motobecane... have seen quite a few that have been unmarked.

I use a very similar saddle on my 1957 Peugeot as I look for a proper Ideale replacement and this came off an old Gitane... will have to flip mine to remember what it looks like underneath.

Thanks for your pictures. You are right. It is really similar to yours. Mine doesn't has the plate piece under the nose tip. Any stamp mark on your saddle?

I forgot to mention that I also got a "unknown brand" frame from this garage sale. That frame doesn't has saddle on it. Maybe is from that Reynolds 531 frame. I will post some pictures of this "unknown frame" later tonight.

Yes, it's a FUJI saddle and the model is BELT.

this is the frame I pick it up from this garage sale. the leather saddle wasn't on this frame but was found in a box full fill with some bike parts.

Sixty Fiver, When you get a chance can you take a look underneath of your saddle in this picture. Thanks! The outside looks almost exactly same as mine. I suspect maybe the pearl white paint frame was a French bike and this saddle was from that French bike frame? Maybe?