It's under M38 here. http://7.62x54r.net/MosinID/MosinFeatures02.htm Based on the ones I've seen it was primarily at Izhevsk from 1940 to 1942. You just never know what Tula is going to sneak in though.
I should probably look back through my collection. It's easy to overlook this feature and I may have more. In 1945 Izhevsk reused a lot of receivers and it wouldn't surprise me that they were using up other miscellaneous parts on M44s.
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