The Glenfield 60 was around $10 cheaper at retail price than the Model 99
A retail for the Glenfield 60 of about $40 would likely be around '68.
The Marlin 99 was retail at $50 about then.
But stores used to heavily discount the Glenfield line so the time line may be off, especially considering the 'scope included.
99/60 recv's started to be grooved for scopes in 1964.
None of these rifles were ser#'d previous to the GCA68. Didn't need to be by Fed Law.
Marlin would sell a rifle with a scope. But they would package the scope unmounted/separate from the rifle.
That way they avoided paying a few cents Fed Excise Tax on the Firearm which is figured on the full value of the gun.
If the Scope is mounted,,the value of the scope and mounts would be figured in that 'full value of the firearm'.
Same with a Sling. They might include one, but never mounted on the rifle. Packaged separate.
JC Pennys also had a Mod60 built for them with just their JCPenny name on it as well.
Quite a few Box Stores had that contract type Model 60 rifle built by Marlin.
Coast to Coast Stores, was another that I recall. There were others the names escape me now.
We used to get a lot of warantee returns back from those places at the factory. Most at that time (71/72) were for FTEject in the Model 99 type rifles.
Marlin had a big problem with the feed throats. The ejector was part of the feed throat.
The feed throat was a sintered metal part, 2 halves rivited together.
The ejector was cast as part of the left half. Just a small protrusion expected to be enough to kick the shell off of the bolt face as the bolt came back in recoil.
The sintered metal wore off so quickly that some or the rifles wouldn't even get out of the Range w/o failing.
The idea to use the hooked captured end of the carrier spring as a ejector point was from another gunsmith in the Repair dept.
He made up a spring by hand and fitted it to a rifle.
He had the Range fire the gun as much as they could to see if the ejector failed. It did not.
He had already submitted the idea in Marlins employee suggestion/idea system to improve the company. $$ was awarded if the idea was good enough. Lots of Factorys used such a program.
Obviously this would save the company a lot of $$ and headaches.
They refused him anything saying their R&D Dept was already on it.
...Sure they were.
The new ejector using that very system went into use after that.