Quote:
Would you buy bullion now and sell it back then? You would lose a lot on the price.
Don't forget to adjust for inflation, or in this case
deflation.
Inflation CalculatorQuote:
Inflation Calculator: (1850-2008 conversion) "What cost $1 in 1850 would cost $25.58 in 2008.
Also, if you were to buy exactly the same products in 2008 and 1850,
they would cost you $1 and $0.04 respectively."
In other words, one U.S. Dollar in 1850 had the purchasing power of
$25.58 of 2008 U.S. Dollars.
You would still lose value on gold bullion. $20.47/oz. (1850) times
$25.58 yields a 2008 Dollar value of $523.62/oz., and Gold spot price
today is $1123.60 (meaning that Gold is double its 1850 value, or in
1850 Gold was half its 2008 value, even
after adjusting for
Dollar inflation!)
Silver, you're better off. 89¢/oz. (1850) becomes $22.77/oz. in 2008
Dollars, and today's spot silver is $17.62, only 77% of the 1850 value,
after adjusting for inflation.
I don't know what aluminum went for in 1850, but it was obviously a
multiple factor of the 2008 value (after inflation adjustment), and
if your time machine has a 'mass limit', aluminum is a lot lighter
than gold or silver.

Obviously we could make counterfeit notes today that would have
'passed' back then, but if we're talking the late 1800's and early
1900's, you could buy circulated Gold Certificates from that period
that cost much less in today's Dollars than the bullion value of the
coins that you could exchange them for at the time.
Buy something like a common circulated $20 Gold Certificate for $200
today, then when you're back in its time period, you'd have $500+ in
equivalent to 2008 Dollar purchasing power. Even better, cash them in
at the bank for Double Eagles, then bring them back and each one has
over $1000 of current bullion value (and you might even get a key
date or semi-key back then, if you were lucky!)