Lugers are "slow" assets, much like other real property.
The pricing is dependent upon supply (which is fixed, and perhaps dropping) and demand (which has been consistently increasing).
I think that the key is to properly document acquisitions and their cost, and then periodically re-check their value. This should be documented over time, including the dates of calculation.
It's probably not a good idea to keep these things secret, or try and misdirect family on what you're spending / investing. There are stories of inherited guns being sold for the prices the buyer mentioned to the family. You know... $75 Lugers...
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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