An unidentifiable Summit?

[tmenyc]

First, I'm trying to reach out to Paul (Northlodge) for help, but it appears that he is no longer active here, and his Summit website does not respond. If anyone here can reach him and/or give me his email address (with his permission) I'd be appreciative. 

Meanwhile, 
I have a Summit in front of me that I can't identify: 127mm long (4+7mm shorter than almost every similar Summit I've seen), black celluloid, flat-top, slightly rounded base, Curzon riveted clip/lollipop lever, WHS branded nib, HR crown and section. There is just a faint hint of a model imprint, S (space) 0. A couple of unhelpful pictures are attached, but the picture won't help, since superficially it looks like every other riveted-Curzon clip Summit. There is absolutely no model imprint in the main imprint; only "unbreakable". 

It's a mystery -- if I had to guess it would be an S.100 in a short form. Any ideas? 
Many thanks, Tim