I purchased this Japanese Lou Gehrig from a reputable ebay seller a while ago, but I've finally gotten around to try to get this holdered by SGC, and I would need to provide them details of what set it would be from. Does it look familiar to anyone on what it could be, and are there any guides that document this issue?
When I purchased the card on ebay, the seller said it was a 1931 Shinkoseika Postcard which is similar to the JBR105 Bromide set. I've seen one other postcard similar to this one for Lefty Grove here:
https://www.net54baseball.com/showthread.php?p=2066953
or
https://www.net54baseball.com/showthread.php?t=295874
or (w/ back translated in post 16)
https://www.net54baseball.com/showthread.php?t=257444
where Brad states that it is a Niitaka postcard. Is that also from 1931? Is there any conclusion on what set this is? Niitaka, Sinkoseika, or something else? Thanks!