Justhorsnround
What you put in your original post is what I said in my original post. (read the second sentence of said post).
Please read my response to Mike B below - as I guess I did not make my real question clear in the original post.

Mike B
Thanks I had decoded the same info from the serial number. What I don't know is if that is April of 46 or April of 47. I didn't make that question clear in my original post.

Spanky
I had previously come across the OS as first design but had forgotten. Thanks. According to Chevys of the 40s the OS was manufactured in 1945 but no year(s) given for PK. My research thus far says OS began in August of 1945 for the 1946 model year.
I don't know when the switch to PK happened.
The 1946 truck vehicle information kit on gmheritage site was published 5/01/1946 and it shows the PK (second design) model. There is no 1945 vehicle information kit.
No help there for actual calendar year of manufacture. Maybe I can find out how many of these trucks were actually made in Oakland. That would be a good indicator ....

BTW, he did send me a pic of the plate and it has the serial# stamped on it that I posted previously. The plate looks to be new - perhaps made from the old plate or he had it restored. It is the number that is on the registration/title.

I guess as long as it has clear/clean title - I should be happy. IMHO the 47 registration makes the truck's lineage confusing. Even though we all know it is a 46 at heart and parts :-)

Thanks again for all your insights and help.

Last edited by moosemoon; 02/03/2021 10:35 PM. Reason: forgot to finish sentence