Jim,

I saw the Unknown Tropical Fish cards that you posted.
I send a check list of these cards to Todd in July of 2011. I have been going to send him images of
the cards for his webb site ever since then, better late than never. Dan may want them also.
I know nothing about how or by who they were issued.
The cards are 5" X 5" square.

Ken

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I would guess the set dates to circa 1932-1933.

The subject of cards #5 and #8 match the photos on the covers of issues #5 and #8 of The Aquarium Magazine from 1932:

Thanks Ken
Seems unusual to send a letter to an address without a heading.
Yours are also "scored" and therefore "collected", not redeemed.