Lets see the opposite side of the stock . That is where the disc should be . Need more photos to see if you have an Elm stock ?Serial number is 90089, initials are HK, Model 94 (never had an extension), 1917, no disk, and I think the wood is elm. The stock is a tight straight grained wood with no figuring anywhere. I've attached a picture of the stock.
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Dan
Your photos show that you have an ELM stock . Very nice condition . The stock disc cutout is only on the right side . Nothing but the slot on the left side .Here ya go.
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Is this enough?
Dan