Magic item idea

In my campaign, the players are after a customized
ship, lots of money.  This guy gave them a magical
pouch.  Here is my description.  I have decided not to
post the business though, as i haven't really
developed it yet.

Trynn's Pouch of Leisurely Payment

EXP:  10,000
Useable: anyone

Trynn, the famous shipbuilder, and his employees had
the problem of people doing a down payment and them
disappearing with the ship, never to pay again! Trynn
paid a mage to make some of these pouches for him. 100
exist but the mage is continually making more, until
his contravt of 1000.  The pouch looks like a small
pouch, bulging with coins.  When the pouch is opened
it is empty, except one can see that, no matter the
lighting, there is what appears to be a disk of
annhilation (same stats as sphere of annhilation
except that it is flat.)  When someone puts anything
of value into it (magic items, gems, coins of any
value, etc.) the bag uses a combination of chronomancy
and divination spells to find out where and when the
thing (for a gem or item anyways) would get the
highest price. then the item drops through the dark
disk. It is sent to the best time, there it will be
sold, the money converted, then its sent to the
accounting offices of Trynn shipwrights, Inc.  After
three seconds is up, and the account is accredited,
the inside of the bag lights up in a blinding flash,
saying how much is still owed.

C.J. Miller
P.S. send me comments on this item please, also if you
need more info on it (if there is something I forgot)
tell me and ill post it too.)

=====
" I can see you Kirk.  can you see me?"
     General Chang  Star Trek The Undescovered Country
     "Namárie, Hennaid evyr."
     Quenya/Sindarin for farewell, many thanks
     " They  invade our territory and we fall back.
     They assimilate entire worlds and we fall back.
     The line MUST be drawn here!" Capt.Picard ST:FC
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