Very interesting. Thanks for the infoOld Unertl's have shot up in value in recent years, but you can still occasionally find a good deal. The 1.25" scopes usually fetch more because it's the correct model for the USMC 1903A1 Sniper and the Model 70. The 8x models are especially pricy because people want them for the aforementioned rifles, but also because the 8x magnification is the only one allowable for CMP Vintage Sniper matches. I won't lie in that this one is technically not correct since it's 10x - which doesn't bother me for the type of rifle it is.
I picked this one up for $500 (got lucky on GB), but I've seen them for as much as $1200.00. While this scope and model is correct, the actual scopes marked USMC-Sniper go for considerably more - usually $4000-6000 bucks depending on the condition and included accessories.