Yet another Argo ID question..

[Bookm97]

I'm not getting a response from Argo (just requests for test-drives).

Here's pics of (3) gearboxes I have. The first (2) I generally know the age. It's the 3rd one I call the "Mystery Argo". Having some difficulty identifying.
60s-1 copy.jpg 70s-1.jpg Argo-1.jpg
Any thoughts would be appreciated.

I'm thinking early 80's. It has 1-1/4" axles, reinforced heavy-duty frame, and chain adjusters, so I think that excludes the 70's.
Was hoping it was 1981 (the year I worked there). Then there's a chance I built some of the components, perhaps even the gearbox

Thanks,
Sean

[Bookm97]

Ah, Never Mind. Argo just responded, LOL.
It's a 1982.

Engine: #2069E (probably a 16hp Tecumseh)
Ser.: HT5023 (not sure what the "HT" stands for.