Wade,
That is pretty much how I understood them to be made. I don't remember where I heard that. No documentation to support it. I think that even some of the new carbons maybe done the same way. The Fleetglass( Fleetwood) was sized in deflection numbers.
I have some Micro-Flite arrows from the early 60s that were stored upright in a divided arrow box in a garage attic. The upper part of the shaft that was not inside the box, is a dark brown and the surface glaze is gone making the surface rough. This occured from the heat, I'm sure. This upper part of the shaft could be confused with a Fleetglas with the exception of the roughness.
The Shakespeare Rifled Glass shaft had the fiberglass spiral wrapped plus it was a tapered shaft.The sizing on this shaft was stated;"Spine Weight 45".
I have a dark green(?) woven glass arrow that has stamped on the side "Grand Junction Archery" and "K 8" both in white ink(?). Gordon glass was sized using letters only and they went up a "J" size not a "K". I can't find a seam on this shaft, and don't know who made it.
Later Browning, and Graphlex shafts were also a dark color.
Micro flight were sized with numbers-6,7,8 etc.
Bear introduced "Bearglas" in 1957 until 1959. It is stated in the ads as a tan color.
In 1960 Bear now advertises these as Micro-Flite (shafts by Laminex).In 1962 Bear shows the Micro-Flite(shafts by Sila-Flex).
I have another glass/plastic(?) arrow with an Ace broadhead. It is a creamy tan/orange color and is translucent so a person can that it is hollow. It has a wood plug on the tip end that is tapered for the broadhead. This is not a woven material. Molten material drawn through a die?