A friend of mine recently sent me this sword to look over. He's had it for several years now under the assumption that it is Shinto Ishido School work. That was the opinion of the togishi that last worked on it. It very well could be Ishido work.
Last week I posted this sword on a Nihonto Facebook group and started a decent discussion. I've had quite a few very good and informative opinions on this sword so far. Some suggested it could also be a ubu Koto Bizen Uchigatana. Before I thoroughly examined this sword and asked around a bit, I originally thought it was O-suriage. The yaki-dashi and second mekugi-ana threw me off. I figured I would post it on NMB and get a few more opinions. A much broader audience here on the NMB.
This sword has recently been returned to its owner. He plans to send it away for a new shira-saya and papers soon. Any and all opinions are welcome. Thanks.