Many of you will know these sites already, but they may be helpful to others.
Sites I refer to all the time for pen identification:
For Burnham pens:
For Swan pens:
For Conway Stewart pens:
For Summit and other Langs pens:
For Parker pens:
For American pens:
For a most entertaining and informative blog:
For pen discussion:
I don’t go there, but to each his own.
For UK pen repair:
For nib work and USA pen repair:
For pen repair tools and supplies:
That’s a start. Tell me your most useful pen URLs.