Send an email to Ulla Bergwall at the Volvo Archives giving what numbers you have and a short description and ask for details of the production date. She will provide a list of all the numbers and the day it passed final inspection - "Reported OK".

ulla.bergwall@coor.com

Volvo's production year started after the return to work after the summer holiday/shutdown for maintainence/setting up for a model change. This means that cars made after this, September on, would be considered as the following years model. Companies in Europe often used the Brussels motor show in October/November to show off new models. This often gave a boost to dealers whose customers often waited until the 1st January before taking delivery of a new car. They would then order to get the car a few weeks later.
This is how your '68 got itself registered as '67. Regardless of your opinions of your DMV all they did was to "register" the car. Only if a seller misrepresents the car as being newer than it actually is does "fraud" in several different guises come into play. Now days, half year models are common and this does help with this problem. The customer often gets a good deal on the older model too. I don't know if back in Amazon days Volvo sent cars to all the dealers regardless of whether they had an order or not, like they do now. The dealer probably had one of each model if he was lucky and relied mostly on custom orders to get the colours the customer wanted. Not much in the way of options!

Your car has an in between spec with the split circuit brakes rather than true dual circuit ones. This was enough to meet the USA requirments until the B20 models with dual brakes came along. It was also the end of the USA amazons as only a few B20 models were imported officially. Only about 2500 B20 wagons built and most if not all sold in Scandinavia, No RHD versions.

Good luck with yours. The pics show that will be a bit of a challenge.
Derek '66/67 220