[Fot] Rocker shaft identification

[Dave]

Hello Friends,
I have a couple TR 2-4 rocker shafts in my stash of parts and I think they might be factory NOS, but have no Stanpart or other identification.
I have attached a photo and wonder if anyone can help confirm their origin.  Their packaging might be familiar to someone
They were nice and tightly wrapped in cardboard sleeves and have a G and A stamped in one end of the shaft.  They have no threaded plugs as I have found on the last one I bought.  
They seem to be quality parts and I'd like to put them to use.  

Thanks,
Dave H.

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