Hello Ugley_Igley, Blue and ODK members & Guests

First, welcome to these forums. I'm sure we can help.
I have always called these the first Mayfair base - the V53 and V54
machines made between 1965 and 1968.

The first Mayfairs (Stencil is an synonym for store brand) did not
appear with any identification they were Victas. The cowling on your
machine has the Victa logo.

Second, having the muffler on the same side as the height adjuster is a no-no.
This leads me to believe that your machine is a 'bitsa'.
It's a shame the stencil is missing from the base.

Hope this helps.
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JACK.