Help Identifying Onoto Pen

[ADO]

Hello

 

I'm looking to confirm what this pen is.  The pend itself and research I've done indicates it's an Onoto No. 50 with a 15 nib.  The top of the cap is conical with a point and is a brownish colour.  The pen bottom is a dome shape in black.

 

Can anyone tell me the approximate period it was made; what its made from (I'd guess bakelite?); and the name of the colour (it seems to have blue and dark blue/black marbling).  Anything about the size 15 nib?

 

The inscription on this pen says ONOTO

                                                      MADE IN GT. BRITAIN

                                                      N^o.50

 

The nib says ONOTO

                       14^CT

                          15
 

Any help appreciated.

 

Thanks

 

Adrian

[johnmc2]

I have owned a few of these, They only seem to turn up in Australia or New Zealand.  I would not be surprised if they were exported from the UK during the 1950s.  There is also a No.51 (shown below in green/black)and a No.16 (red/black) all very similar in design.  I think they are celluloid pens with hard-rubber cap-screws

[ADO]

Thanks johnmc2.  I was intrigued by the lack of a cap band; seems unusual and may signify a cheaper model?