If any one is interested, I found this listing for a low mount scope numbered to Rifle 71864.

https://www.ebay.com.au/itm/SMLE-No1-Mk3-HT-Low-Mount-Aust-sniper-Scope/223254335623?hash=item33fafed087:g:79YAAOSw5Ylb--Ga:rk:1f:0
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