B190 Enthusiasts

I've tried searching but do not specifically see what I am looking for. While the build data and history seems fairly complete regarding the units built in Jackson Center, Ohio. My questions refer to the very first built by Okanogan. From what I have found, it does not appear these early units were given Airstream serial numbers? Or even given credibility in the overall counts? It seems the '89's built in Ohio have the one full overhead bunk window? Possibly the below units are 1988? Mine was built in June 1988.

I understand I am in a minority as most have later model units. However, I find the history interesting. This document supports my belief that 1. The B190 actually started in late 1988 and 2. The units built in the Canadian Plant were not given the sequential serial numbers.

And yes, I do have an ulterior motive; we are looking at selling ours this fall so I need to obtain all the information I can.