Would like help identifying a Onoto pen

[Bal4]

Hi 

 

I was gifted this old Onoto pen and would like help identifying what it is. 
 

I noticed that other have a model number under where is shows MADE IN  GT BRITAIN this one does not. 
 

The lever won’t move more then 45 degrees so i guess the bladder has dried up.  

Any help would be much appreciated 

 

Thanks 

Michael 

[como]

It could be an Onoto No.50 made in the late 1950s. What does the nib imprint say, is it an Onoto 15 nib?

[Bal4]

Thanks for the reply. 

 

It is a Onoto nib but with a 22 on it @como

[como]

Then likely an Onoto Junior lever-filler (those had 22 nib), but curiously it doesn't say "Onoto Junior".

[Bal4]

Definitely JR is not written any where on it