Is there any "easy" way of identifying #155? I've been trying to fill that hole in the collection and so far have ended up with two #166 and a #191. I just brought home this stamp

and don't really want to send it to Weiss for identification if I can do it myself. Any suggestions.
Also, how can I get ahold of Seal, I've looked for the site but my technology skills are pretty minimal.
Thanks Dave